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【题目】- I have been to Mars several times.

-You ______ be joking. It's impossible.

A. can B. may C. must

【答案】C

【解析】

试题分析:句意:-我去过几次火星。-你一定是在开玩笑。那是不可能的。A. can能,表示能力;B. may可以,可能,表示许可、请求;C. must必须,强调主观愿望;一定,表示推测。人还未到过火星,你一定是在开玩笑。故选C。

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