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    精英家教网 > 高中英语 > 题目详情
    -- A medical team was sent to Japan by air five hours ago.
    ---So they_____ have arrived by now. The flight usually takes four hours or so.
    A．mightB．couldC．needD．must
    D

    试题分析：句意：一个医疗队在5个小时前已经派往日本。所以他们到现在为止肯定已经达到了，航班通常是花费4个小时的。must have done肯定已经做了某事，表示对过去的肯定推测。故选D
    点评：情态动词是中考的热点，情态动词除了表推测外，还可以表达另外的意思，如must理解为必须，由这个词所开头的问句，肯定回答用Yes,you must.否定回答用No,you needn’t或者是No,you don’t have to.注意不用mustn’t，因为mustn’t表示例行禁止的含义。
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