問題詳情

22. --Why does the Lake smell terrible?--Because large quantities of water .
(A) have polluted
(B) is being polluted
(C) has been polluted
(D) have been polluted

參考答案

答案:D
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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