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13.Why isn't Cathy here yet?
---She _________ to be picked up at the station.(  )
A.could waitB.must wait
C.might be waitingD.can be waiting

分析 --Cathy为什么还没有到?
--她也许在车站等人接她.

解答 答案是C.本题考查情态动词表示推测的用法.首先,对正在进行的动作的推测往往用"情态动词+be doing",答案在C和D中选择.情态动词might表示推测往往用在肯定句和否定句中,而can往往用在否定句和疑问句中表示推测,本题是肯定句,排除D,答案选择C.

点评 首先理解各情态动词的基本用法,整体把握语境中的情感态度,最后做出合理的判断.

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