Select the correct verb form for the dependent clause:

The ethics committee insisted that the lead researcher ________ all confidential patient identifiers prior to publication.

Answer and explanation

Correct answer: C. redact

Answer: redact. Why not the others: 'redacts' uses the third-person singular indicative present, violating the formal mandative subjunctive rule; 'redacted' uses the indicative past tense; 'must have redacted' introduces an epistemic modal deduction that alters the intended imperative directive.
  1. Step 1: Identify the governing matrix verb: 'insisted' belongs to the category of mandative verbs (such as 'demand', 'recommend', 'require', 'insist') that take a mandative that-clause.
  2. Step 2: In formal English and standard academic testing, a mandative that-clause requires the base subjunctive form of the verb regardless of the tense of the governing verb or the person/number of the subject.

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