問題詳情

20 Many UFO sightings can’t _____easily because most of the time people don’t know exactly whatthey have seen.
(A) explain
(B) have explained
(C) be explained
(D) have been explained

參考答案

答案:C
難度:適中0.666667
統計:A(0),B(2),C(4),D(0),E(0)

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