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    精英家教网 > 高中英语 > 题目详情
    Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
    A．whileB．orC．forD．so
    A
    考查连词;A. while 当…时候，虽然，然而，B. or否则，C. for因为，D. so 因此，句意是;大多数鲸鱼几分钟后要浮出水面呼吸，但还有些可以在水下呆一个小时或更多。选Ａ。
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