题目内容

What ________ if there ______ no water or air on the earth?
A．happen, isB．will happen, is
C．will happen, will beD．happen ,are
B

试题分析：句意：如果地球上没有水和空气，将会发生什么？根据句意判断，句子要用一般将来时，water为不可数名词，并且if 引导的状语从句用一般现在时表示将来所以用单数is ，故选B
点评：此考点也是中学英语中最喜欢出现的考点，if除了可以引导条件状语从句外，还可以引导宾语从句，翻译成“是否”。引导宾语从句时没有“主将从现”的说法。除了if外，还有when, as soon as也一样要注意“主将从现”。
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