Could you tell me ( C (为什么不选D)

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Could you tell me ( C (为什么不选D)
A.when did Tom come back
B.when does Tom come back
C.when Tom will come back
D.when Tom comes back

D的时态不对,comes back是一般现在时态,这里是将来的情况“能告诉我他什么时候回来吗”,也就是说还没有回来.
要注意when引导的时间状语从句和引导的宾语从句等的区别；when只有引导时间状语从句的时候,才不用将来时态.
例如：When he comes back please tell me to see me.他回来时,请要他来见我.（when引导时间状语从句）
题目中when引导的是宾语从句,做tell“告诉”的直接宾语,又如：
I don't know when he comes back.我不知道他什么时候回来.（when也是引导宾语从句,做know的宾语）

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