He failed the mid-term examination and only then how much time he had wasted.A. had he realized B. did he realizeC. he had realized D. 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 mid-term examination and only then _______ how much time he had wasted.

A. had he realized B. did he realize

C. he had realized D. he realized

【解析】

试题分析：考查only的用法辨析。句意：他在期中考试中失败了，直到那时他才意识到自己浪费了多少时间。Only引导的句子，若only位于句首，则从句用半倒装结构。由failed可知，动作发生在过去，用一般过去时。故选B.

考点：考查only的用法

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