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

試題分析：句意：如果地球上沒有水和空氣，將會(huì)發(fā)生什么？根據(jù)句意判斷，句子要用一般將來時(shí)，water為不可數(shù)名詞，并且if 引導(dǎo)的狀語(yǔ)從句用一般現(xiàn)在時(shí)表示將來所以用單數(shù)is ，故選B
點(diǎn)評(píng)：此考點(diǎn)也是中學(xué)英語(yǔ)中最喜歡出現(xiàn)的考點(diǎn)，if除了可以引導(dǎo)條件狀語(yǔ)從句外，還可以引導(dǎo)賓語(yǔ)從句，翻譯成“是否”。引導(dǎo)賓語(yǔ)從句時(shí)沒有“主將從現(xiàn)”的說法。除了if外，還有when, as soon as也一樣要注意“主將從現(xiàn)”。
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