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為什么還沒有到？
--她也許在車站等人接她．

解答 答案是C．本題考查情態(tài)動詞表示推測的用法．首先，對正在進行的動作的推測往往用"情態(tài)動詞+be doing"，答案在C和D中選擇．情態(tài)動詞might表示推測往往用在肯定句和否定句中，而can往往用在否定句和疑問句中表示推測，本題是肯定句，排除D，答案選擇C．

點評 首先理解各情態(tài)動詞的基本用法，整體把握語境中的情感態(tài)度，最后做出合理的判斷．

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