My English-Chinese dictionary has disappeared. Who _____ have taken it?
A．shouldB．mustC．couldD．would
C
考查情態(tài)動(dòng)詞表示推測。根據(jù)問句可以看出語氣不肯定，所以B排除。should have taken表示“本該拿（實(shí)際未拿）”，would have taken“本來會（但沒有），均不合題意，可排除。情態(tài)動(dòng)詞could在交際用語中常表示語氣的委婉，而不表示過去時(shí)，如：— Could you tell me the way to the supermarket? — Sure.（注意不能用Yes, I could.或No, I couldn’t.來回答）
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