Rarely ______ so many errors in a single page of a professional report.

Answer and explanation

Correct answer: C. does one find

  1. Step 1: 'Rarely' at the start of the sentence forces inversion with 'do' support, giving the present simple.
Answer
does one find.
Why not the others: "finds one" is wrong because without an auxiliary the verb cannot invert. "one does find" is wrong because the auxiliary must precede the subject. "one finds" is wrong because 'rarely' at the start requires inversion.

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