问题: 选择题
The govermment has to close those small factories to prevent the water of the river ____.
A polluting
B from polluting
C being polluted
D polluted
(说明为什么)
解答:
选C
prevent...from doing sth.是固定词组,意思是"制止,阻止",其中的from可以省略
由于水被污染是被动的,所以A,B都不对,选C
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