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I’m not sure if Tom _____. If he______, ...

I’m not sure if Tom _____. If he______, I will call you.

A. comes; will come    B. comes; comes    C. will come; comes

 

C 【解析】句意:我不确定汤姆是否会来。如果他来了,我会给你打电话。前一个if引导的是宾语从句,“是否”的意思;预测将来的动作,用一般将来时态;后一个if引导的是条件状语从句,用一般现在时态表示将来,故答案为C。 点睛:if作为连词,引导条件状语从句,表示“如果”等。在复合句中如果主句用将 来时,则if引导的状语从句用一般现在时。 如 :If it doesn’t rain, we will go to the picnic next Sunday. 如果天不下雨,下周日我们将去野餐。if作为连词还可以引导宾语从句。引导宾语从句时和whether意思相同。例如:She asks me if /whether I like it. 她问我是否喜欢它。  
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