—Listen! Is Mary singing in the next room?—No. It _______ be Mary.She has gone to Shanghai for
—Listen!IsMarysinginginthenextroom?—No.It_______beMary.ShehasgonetoShanghaiforanimpor...
—Listen! Is Mary singing in the next room?—No. It _______ be Mary.She has gone to Shanghai for an important meeting. A.can’t B.may not C.mustn’t D.needn’t
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