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—Whydoestheriversmellterrible?      —Becauselargequanti...

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—Whydoestheriversmellterrible?      —Becauselargequanti...

—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:動詞時態與語態

題型:選擇題