题目内容
4．-Where are you going this weekend？-We haven't decided yet．If it________，we'll probably climb the mountain．（ ）
| A． | won't rain | B． | rains | C． | doesn't rain | D． | raining |
分析 -你们这个周末干什么？-我们还没决定．如果天不下雨，我们很可能去爬山．
解答 正确答案：C．if 引导的条件状语从句遵循"主将从现"的原则，则从句应用一般现在时（主语+动词原形）．根据句意如果天不下雨，我们很可能去爬山，rain是实义动词，其否定结构应借助助动词does，故选择C．
点评 本题考查if条件状语从句，掌握其用法，根据句意即可作出选择．
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