Complete the sentence:
'Little [...] that their initial field observations would lay the groundwork for an entirely new branch of quantum biophysics.'

Answer and explanation

Correct answer: C. did the researchers suspect

  1. Step 1: Negative adverbial 'Little' at the head of a sentence requires subject-auxiliary inversion in the simple past: 'did [subject] [bare verb]'. Step 2. Correct form: 'did the researchers suspect'. Answer: did the researchers suspect. Why not the others: Inversion with auxiliary 'did' is mandatory after introductory 'Little'.

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