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    精英家教网 > 高中英语 > 题目详情
    Why did they keep trying _________ they must have known it was hopeless?
    A．ifB．becauseC．when D．whether
    C
    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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