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

本題考查動(dòng)詞的時(shí)態(tài)和倒裝句的用法。根據(jù)語(yǔ)法要求only引導(dǎo)狀語(yǔ)位于句首時(shí)，需要使用倒裝句結(jié)構(gòu)。而該狀語(yǔ)only then表明了動(dòng)作發(fā)生在過(guò)去。

 

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