I don’t know he will come tomorrow, he c...

I don’t know he will come tomorrow, he comes, I will tell you.

A．if; whether	B．whether; whether
C．whether; if	D．that, whether

C 【解析】if既可以引导宾语从句又可以引导状语从句。if充当宾语从句的连接词时，相当于whether，词义为“是否”，遵循宾语从句的时态规则，可根据语境选择任何时态；充当从属连词，引导条件状语从句时，词义为“如果”，若主句中的谓语动词用一般将来时，则从句中的谓语动词通常用一般现在时表示将来。

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