【題目】I_______ my homework when my mother________back.

A.is doing；came B.was doing；come

C.was doing；came D.is doing; is coming

【答案】C

【解析】when引導(dǎo)的時間狀語從句前后時態(tài)要一致，利用排除法，A、B、D時態(tài)前后不一致，不符合語境。

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