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In each of these questions, a sentence has been divided into four parts and marked a. b, c and d. One of these parts contains a mistake in grammar Idiom or syntax. Identify that part and mark it as the answer.

A. If only I would have studied that one chapter

B. just on the eve of the examination

C. I could have answered all the questions

D. and obtained over eighty percent marks

Please do not use chat terms. Example: avoid using "grt" instead of "great".