Something must be done to prevent city________ by thick smoke.A.to be pollutedB.from pollutingC.from being pollutedD.polluting【精析与答案】 C 求详解
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Something must be done to prevent city________ by thick smoke.
A.to be polluted
B.from polluting
C.from being polluted
D.polluting
【精析与答案】 C 求详解
prevent something from .(这里填名词性成分,即名词或动词+ing)
所以排除A D
B C 语气一个主动一个被动,防止城市被污染.所以选C.
1. 首先 prevent ... from... 是固定词组,
2. from是介词,后面要接名词或动名词。
3. city 和thick smoke是被动关系介词用了by,(防止城市 被 浓烟污染)。所以谓语部分必须表被动。be polluted
综合以上3点,选C
prevent sth from doing 防止某物做什么
而polluted 是形容词,要加动词be
所以为prevent city from being polluted
(polluted 某物被污染 polluting 污染某物 根据句意用polluted)
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