问题
选择题
Mary _____ be in London because I saw her in town just now. [ ]
A. mustn't
B. isn't able to
C. needn't
D. can't
答案
答案：D
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Mary _____ be in London because I saw her in town just now. [ ]
A. mustn't
B. isn't able to
C. needn't
D. can't
答案：D