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3.-Shall we play basketball on the playground this Saturday afternoon?
-We'll go if it                   .(  )
A.rainsB.will rainC.doesn't rainD.won't rain

分析 ---这周六下午我们去操场上打篮球好吗?
---如果不下雨我们就去.

解答 答案:C.if引导的条件状语从句,遵循主将从现的规则,从句主语it,借助于助动词does构成否定,故答案是C.

点评 1.if从句用一般现在时,主句用一般将来时  
If he runs  he'll get there in time.如果他用跑的,他就会及时赶到那儿. The cat will scratch you if you pull her tail.如果你拉猫的尾巴,它就会抓你.  
2..if从句用一般现在时,主句用may/might/can 
If the fog gets thicker the plane may/might be diverted.如果雾在大一些,飞机可能就会改在别的机场降落. 
If it stops snowing we can go out.如果雪停了,我们就可以出去.

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