Why did they keep trying they must have known it was hopeless?A. ifB. becauseC. when D. w

发布时间：2020-08-16 20:37:30

Why did they keep trying      they must have known it was hopeless?
A. if
B. because
C. when
D. whether

网友回答

A. if
B. because
(答案→)C. when
D. whether
解析：这题考查连词的用法，when表示“既然”句意是：既然他们已经知道是无望了，为什么还要一直尝试呢？选C。
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