問題詳情

7 What___________ an environment disaster is fortunately prevented because the newest detecting machine proves tobe working.
(A) do we call
(B) should be
(C) shouldn’t have been
(D) could have been

參考答案

答案:D
難度:困難0.375
統計:A(10),B(8),C(6),D(18),E(0)

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