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

A．happen, isB．will happen, is
C．will happen, will beD．happen ,are

B

解析試題分析：句意：如果地球上沒有水和空氣，將會發(fā)生什么？根據句意判斷，句子要用一般將來時，water為不可數名詞，并且if 引導的狀語從句用一般現(xiàn)在時表示將來所以用單數is ，故選B
考點：if引導條件狀語從句的時態(tài)
點評：此考點也是中學英語中最喜歡出現(xiàn)的考點，if除了可以引導條件狀語從句外，還可以引導賓語從句，翻譯成“是否”。引導賓語從句時沒有“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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