Most whales must come up for air after several minutes, _______ a few can stay under water for ...
Mostwhalesmustcomeupforairafterseveralminutes,_______afewcanstayunderwaterforanhouror...
Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more. A．while B．or C．for D．so
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| 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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