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麻烦老师解答:—Look!The lights i

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麻烦老师解答:—Look!The lights i
—Look!The lights in the teachers' office are still on.Is Mr.Li working?
—No.It _______ be Mr.Li.I saw him leave just now.
[     ]
A.may not
B.mustn't
C.can't
D.needn't
麻烦老师解答:—Look!The lights i
C