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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

 

【答案】

B

【解析】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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