----Whydoesthelakesmellterrible? ----Becauselargequant...
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問題詳情:
---- Why does the lake smell terrible?
---- Because large quantities of water ____________.
polluted B. is being polluted
C. have been polluted D. has been polluted
【回答】
C
知識點:現在完成時及其被動式
題型:選擇題
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