Why did they keep trying _________ they must have known it was hopeless?A．ifB．be_刷题宝

题干

Why did they keep trying _________ they must have known it was hopeless?

A．if

B．because

C．when

D．whether

上一题下一题 0.64难度单项选择更新时间:2012-04-05 12:03:56

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