—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

B

解析試題分析：句意：你知道他什么時(shí)候回來?我不知道,但是他一回來我就會(huì)給你打電話,表示時(shí)間，意為“當(dāng)……時(shí)；在……的時(shí)候”。在時(shí)間、條件等狀語從句里，用一般現(xiàn)在時(shí)表示將來時(shí),when 為何時(shí)時(shí),從句用將來時(shí).結(jié)合句意，故選B
考點(diǎn)：考查時(shí)態(tài)的用法

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