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【题目】—Do you know when back?

—I don’t know. But if he back, I will call you.

A. will he come, comes

B. he will come, comes

C. he comes, will come

【答案】B

【解析】

试题分析:句意:你知道他什么时候回来?我不知道,但是他一回来我就会给你打电话第一个空,when引导宾语从句,主句为一般现在时,从句是什么时态就用什么时态,根据句意,还未回来,故用将来时态;第二个空,if引导条件状语从句,主句用一般将来时,则从句用一般现在时,故选B

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