He failed the final examination and only then ____ how much time he had wasted.

A. he realized B. had he realized

C. he had realized D. did he realize

 

D

【解析】

試題分析：考查倒裝句。句意：他期末考試不及格，并且只有在那時他才意識到他浪費了多少時間。題干中and后的分句使用的是“Only + 副詞 + 助動詞 +主語 + 動詞 + 其他”的句型結(jié)構(gòu)，語境是過去時，他意識到也是發(fā)生在過去，故選D。

考點：考查倒裝句

 

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