Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
Mark delayed writing the book until he had done a lot of research.
A.Mark did a lot of research after he finished writing the book.
B.It was only when Mark had written the book that he did a lot of research.
C.Mark delayed writing the book as he had already done any research.
D.Only after Mark had done a lot of research did he begin to write the book.

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