--When      your mother       you that computer?
---Oh, I have forgotten.
A．does,buyB．has, boughtC．has,hadD．did,buy
D

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。
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