What ________ if there ______ no water or air on the earth?


  1. A.
    happen, is
  2. B.
    will happen, is
  3. C.
    will happen, will be
  4. D.
    happen ,are
B
試題分析：句意：如果地球上沒(méi)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(lái)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(lái)所以用單數(shù)is ，故選B
考點(diǎn)：if引導(dǎo)條件狀語(yǔ)從句的時(shí)態(tài)
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(méi)有“主將從現(xiàn)”的說(shuō)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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