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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】

試題分析:句意:你媽媽什么時(shí)間給你買的電腦?詢問過去的時(shí)間,故用過去時(shí)態(tài),故選D。

考點(diǎn):考查過去時(shí)態(tài)的用法

 

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