Only after multiple independent clinical trials ______ the pharmaceutical agency grant regulatory approval.
Answer and explanation
Correct answer: A. did the federal regulatory agency formally
- Step 1: When a sentence begins with 'Only after + clause/phrase', the main clause must undergo subject-auxiliary inversion. The past auxiliary 'did' precedes the subject 'the federal regulatory agency', followed by bare infinitive 'grant'. Answer: did the federal regulatory agency formally. Why not the others: "the agency granted consent" fails to invert auxiliary and subject in the main clause after initial restrictive 'only after'; "has the department passed" uses present perfect which clashes with the completed historical trials referenced; "was the board approving" uses past continuous which does not convey the decisive completion of regulatory granting.
Practise more Advanced Inversion and Subjunctive Mood.
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More Advanced Inversion and Subjunctive Mood questions
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