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--When your mother you that computer?

---Oh, I have forgotten.

A. does,buy B.has, bought C.has,had D.did,buy

 

D

【解析】

试题分析:句意:你妈妈什么时间给你买的电脑?询问过去的时间,故用过去时态,故选D。

考点:考查过去时态的用法

 

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