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He failed in the exams and only then _____ how much time he had wasted.
A.he realizedB.did he realizeC.he had realizedD.had he realized
B

试题分析:考查only的倒装句,only接状语的时候,谓语动词用部分倒装,then这里是时间状语,句意:当他考试失败了,只有那时他才意识到浪费了多少时间。时态应该是一般过去时,选B。
点评; only的倒装句要注意一定是only后面接状语才能倒装,如果接主语或宾语就不是倒装句了。
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