問題詳情

22. With power failures ________ at an increasing rate, it is time the government started looking for a moreeco-friendly way of living.
(A) happening
(B) to happen
(C)happened
(D) happen

參考答案

答案:A
難度:適中0.40566
統計:A(86),B(16),C(81),D(12),E(0)

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