题目内容：

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

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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...