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 题目和参考答案——青夏教育精英家教网—

题目内容

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　考查动词的时态和倒装句的用法。only引导状语位于句首时，需要使用倒装结构，而该状语only then表明了动作发生在过去，故选B项。

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