Not until the statistical analysis was re-evaluated ______ the significant margin of error in the clinical data.
Answer and explanation
Correct answer: D. did the researchers notice
- Step 1: When 'not until' introduces a dependent clause at the start of a sentence, the main clause requires subject-auxiliary inversion. The past auxiliary 'did' precedes the subject 'the researchers', followed by the base verb 'notice'. Answer: did the researchers notice. Why not the others: "the researchers noticed the major discrepancy" fails to invert the auxiliary and subject in the main clause following an initial 'not until' clause; "noticed the scientists" inverts the lexical verb directly without an auxiliary, violating modern English grammar; "have researchers seen" uses present perfect which clashes with the simple past narrative context.
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More Advanced Inversion and Subjunctive Mood questions
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