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―Look at the lady there. ______ it be Mrs. Green? ―No, it _______ be her. She left for London this m...
题目内容：
―Look at the lady there. ______ it be Mrs. Green?
―No, it _______ be her. She left for London this morning.
A. Must, can’t B. May, mustn’t
C. Can, may not D. Can, can’t
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