polluted 河水被污染,所以用被动
polluting keep ...from doing
some plants and animals are killed by the___(pollute)the rivers.越快越好
some plants and animals are killed by the___(pollute)the rivers.越快越好
还有一个,we must keep the factories from___(pollute)the rivers.
还有一个,we must keep the factories from___(pollute)the rivers.
英语人气：474 ℃时间：2020-03-22 00:56:49
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