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I failed in final examination last term and only then the importance of studies．

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I failed in final examination last term and only then the importance of studies．

I failed in final examination last term and only then ________ the importance of studies．

[]

A．I realized

B．had I realized

C．I had realized

D．did I realize

试题答案

答案：D

解析：

only＋状语置于句首时，主句的谓语应用部分倒装，由then可知应用一般过去时态．

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