题目内容
—You can go to the classroom and ask Mary for help.
—She _______ be in the classroom. I have just seen her on the playground.
—She _______ be in the classroom. I have just seen her on the playground.
[ ]
A. must
B. mustn't
C. can't
D. may
B. mustn't
C. can't
D. may
C
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