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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

 

B

【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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