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—Whydoestheriversmellterrible?—Becauselargequantitiesof...

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問題詳情:

—Whydoestheriversmellterrible?—Becauselargequantitiesof...

—Why does the river smell terrible?

—Because large quantities of water ________.

A.have polluted  B.is being polluted

C.has been polluted  D.have been polluted

【回答】

D 

知識點:現在完成時及其被動式

題型:選擇題

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