We're not sure if it tomorrow．If it ,we won

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We're 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
同学们往往误选B．但两个if从句在句中的作用不同．第一个if从句作宾语,时间状语为tomorrow,用一般将来时；第二个if从句作条件状语,主句中用了一般将来时,从句中要用一般现在时．

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