- I have been to Mars several times. -Yo...

- I have been to Mars several times.

-You ______ be joking. It's impossible.

A. can B. may C. must

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。考点：考查情态动词。

考点分析：

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