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5.(2015•山东潍坊)—Ihavebeentothemoontwice.—Youbejoking!It'simpossible.A.canB.mayC.mustD.need

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5. (2015 •山东潍坊)

—I have been to the moon twice.

—You be joking!It's impossible.

   A. can   B. may   C. must   D. need

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答案和解析
5. C