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He failed the midterm examination and only then________how much time he had wasted.

A. he realized        B. did he realize

C. he had realized      D. had he realized

 

B

本题考查动词的时态和倒装句的用法。根据语法要求only引导状语位于句首时,需要使用倒装句结构。而该状语only then表明了动作发生在过去。

 

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