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,將會發(fā)生什么?根據(jù)句意判斷,句子要用一般將來時,water為不可數(shù)名詞,并且if 引導(dǎo)的狀語從句用一般現(xiàn)在時表示將來所以用單數(shù)is ,故選B
點(diǎn)評:此考點(diǎn)也是中學(xué)英語中最喜歡出現(xiàn)的考點(diǎn),if除了可以引導(dǎo)條件狀語從句外,還可以引導(dǎo)賓語從句,翻譯成“是否”。引導(dǎo)賓語從句時沒有“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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