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