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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】

試題分析:考查only的用法辨析。句意:他在期中考試中失敗了,直到那時他才意識到自己浪費了多少時間。Only引導的句子,若only位于句首,則從句用半倒裝結構。由failed可知,動作發(fā)生在過去,用一般過去時。故選B.

考點:考查only的用法

 

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