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【题目】We are not sure if it________ tomorrow. If it________, we won't climb the South Hill.
A.will snow; snows
B.will snow; will snow
C.snows; snows
D.snows; will snow

【答案】A
【解析】句意:我们不确定明天是否会下雪。如果下雪,我们就不去爬山。连词if有两种用法,一是引导宾语从句,意思是“是否”,当主句是一般现在时态时,从句可为需要的任意时态;二是引导条件状语从句,意思是“如果”, 时态遵循“主将从现”。故选A。

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