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【题目】I don't know if Jack ______back today. If he____back, I'll call you.
A.will come; will come
B.comes; will come
C.comes; comes
D.will come; comes

【答案】D
【解析】句意:我不知道杰克今天是否会回来。如果他回来,我会打电话给你。考查动词时态。本题含有两个if,都是连词,但意义不同。前句中的if意为“是否”,引导宾语从句,和whether(是否)意思相同。后句中的if意为“假如”,引导条件状语从句,主句用将来时,if从句用现在时表示将来。根据句意和时态,可知选D.

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