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I don’t know     he will come tomorrow,     he comes, I will tell you.
A.if; whetherB.whether; whether
C.whether; ifD.that, whether
C
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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