問題詳情

17. To cut down on the garbage, it is essential that all household trash _____ and put into trash bags.
(A) must be classified
(B) be classified
(C) is classified
(D) should classify

參考答案

答案:B
難度:適中0.409639
統計:A(26),B(34),C(4),D(16),E(0)

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