Many rivers ________.

A. have became polluted
B. have become polluted
C. have been polluting
D. have become polluting
B
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科目:初中英語(yǔ) 來(lái)源:月考題 題型:單選題

Many rivers ________.
[     ]
A. have became polluted
B. have become polluted
C. have been polluting
D. have become polluting

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