英语if用法I don't know if it ------tomorrow.if it -----,we'll go

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英语if用法
I don't know if it ------tomorrow.if it -----,we'll go to the Great Wall.A.will rain ,won't rain B will rain ,doesn'train C.rains,won't rains D.rains ,doesn't rain 选什么?为什麽?if有什么用法

选：B.will rain ,doesn't rain
因为：I don't know if it ------tomorrow.“我不知道明天是否会下雨”,if 引导宾语从句,表示：“是否”,“是否会下雨”要用 “if it will rain”.
if it -----,we'll go to the Great Wall.意思是：“如果明天不下雨,我们将去长城”,if 引导条件状语从句,表示：“如果”,在表示将来的条件状语从句中,谓语动词用一般现在时态,所以用“doesn't rain ”.因此综合2个空格考虑,应该选择B.

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