He failed the midterm examination and only then ________how much time he had wasted.
A．he realizedB．did he realize
C．he had realizedD．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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