It is well known to us all that a lot of rivers _______by factories. A.are polluting B.have been pol...
2023-02-05 19:26:37 151次 20102011学年浙江省高一下学期第一次月考英语卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It is well known to us all that a
lot of rivers _______by factories.
A.are
polluting
B.have been polluting
C.are
being polluting D.are
being polluted
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