The board of directors, (A) / after a marathon session lasting six hours, (B) / were unable to reach (C) / a unanimous decision. (D)

• A. The board of directors,
• B. after a marathon session lasting six hours,
• C. were unable to reach (Answer)
• D. No error

COLLECTIVE NOUN AS A SINGLE UNIT: 'Board of directors' here acts and decides as one body reaching (or failing to reach) a single collective decision, so it takes a singular verb: 'was unable to reach'. The six-hour session detail is a distractor lengthening the sentence before the verb.

It was not until (A) / the final quarter that (B) / the company's revenues, which had been declining steadily, (C) / had started to recover. (D)

• A. It was not until
• B. the final quarter that
• C. the company's revenues, which had been declining steadily,
• D. had started to recover (Answer)

'NOT UNTIL...THAT' TENSE TRAP: The construction 'It was not until X that Y' requires simple past in the Y clause to mark the exact moment the action began: 'started to recover', not the past perfect 'had started'. The long non-restrictive clause about declining revenues is inserted to separate the reader from the tense trigger.

Rarely does a company (A) / find itself in (B) / a position where it can dictate (C) / terms to it's competitors. (D)

• A. Rarely does a company
• B. find itself in
• C. a position where it can dictate
• D. terms to it's competitors (Answer)

ITS vs IT'S: 'Its' is the possessive form; 'it's' is a contraction of 'it is' or 'it has'. Since a possessive is needed before 'competitors', 'its' is correct, not 'it's'. A deceptively simple error hidden at the very end of an inverted, formal-sounding sentence — designed to catch fatigued readers.

Not until the audit was (A) / completed did the board realise (B) / how extensive the financial (C) / irregularities had actually been. (D)

• A. Not until the audit was
• B. completed did the board realise
• C. how extensive the financial
• D. No error (Answer)

CLEAN SENTENCE (Advanced): The negative inversion 'Not until...did the board realise' is correctly formed, and the past perfect 'had actually been' is properly used for a state that existed prior to discovery. No error — this sentence closely resembles other 'not until' traps in this set, testing whether students flag every such sentence without checking it individually.

The proposal, which had been (A) / debated extensively over several sessions, (B) / were eventually rejected (C) / by a narrow margin. (D)

• A. The proposal, which had been
• B. debated extensively over several sessions,
• C. were eventually rejected (Answer)
• D. No error

LONG-DISTANCE SUBJECT-VERB AGREEMENT: The true subject is 'The proposal' (singular). The extensive intervening relative clause — containing the plural-sounding word 'sessions' — misleads the verb choice. Correct: 'was eventually rejected by a narrow margin'.

So thoroughly had the (A) / evidence been scrutinised that (B) / no reasonable doubt (C) / could possibly remained. (D)

• A. So thoroughly had the
• B. evidence been scrutinised that
• C. no reasonable doubt
• D. could possibly remained (Answer)

MODAL + BARE INFINITIVE: 'Could' is a modal verb and must always be followed by the base form of the verb: 'could remain', not 'could remained'. The elaborate inversion at the start is a sophisticated distractor placed before a very basic modal-verb error at the end.

The reforms, welcomed initially (A) / by most stakeholders, (B) / has since drawn criticism (C) / from several quarters. (D)

• A. The reforms, welcomed initially
• B. by most stakeholders,
• C. has since drawn criticism (Answer)
• D. No error

SUBJECT-VERB AGREEMENT ACROSS A PARTICIPIAL PHRASE: The subject 'The reforms' is plural, so the verb must be 'have since drawn', not 'has'. The participial phrase 'welcomed initially by most stakeholders' separates subject from verb and creates a false proximity cue.

Had the negotiators insisted (A) / that the clause be (B) / removed entirely, the deal (C) / would have collapse immediately. (D)

• A. Had the negotiators insisted
• B. that the clause be
• C. removed entirely, the deal
• D. would have collapse immediately (Answer)

PERFECT MODAL FORM: 'Would have' must be followed by a past participle: 'would have collapsed', not the bare form 'collapse'. This elementary verb-form slip is deliberately placed at the end of a sophisticated third-conditional sentence with a correct subjunctive 'be removed' earlier, testing whether attention fades by the final clause.

Seldom has a (A) / verdict so divided (B) / public opinion as this one (C) / have done in recent memory. (D)

• A. Seldom has a
• B. verdict so divided
• C. public opinion as this one
• D. have done in recent memory (Answer)

AUXILIARY CONSISTENCY WITH INVERSION: The inverted opening 'Seldom has a verdict...' establishes the singular auxiliary 'has' for the subject 'a verdict'. The final clause must match: 'has done', not 'have done'. The long intervening clause causes the auxiliary to drift in students' minds by the sentence's end.

Only after the second (A) / independent audit had confirmed the discrepancies, (B) / and the board convened an emergency session, (C) / was the chief financial officer asked to resign. (D)

• A. Only after the second
• B. independent audit had confirmed the discrepancies,
• C. and the board convened an emergency session,
• D. No error (Answer)

CLEAN SENTENCE (Ultimate Trap): The fronted 'Only after...' clause correctly triggers subject-auxiliary inversion in the main clause: 'was the chief financial officer asked to resign'. Sequence of tenses, inversion, and passive voice are all correctly executed. No error — reserved as the final question to reward candidates who verify rather than assume.