The goverment must take measures to prevent the river____.
A polluted B polluting C from polluted D being polluted.
人气：350 ℃ 时间：2019-10-11 18:05:07
解答
D 句型：prevent sb/sth from doing sth 由于河不能自己发出污染的动作只能由别人来实施故要用被动语态,被动语态结构是be + ved由于from要跟ing形式所以是from being polluted.from 常可省略.
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