. Mary _____ be in London because I saw her in town just now.
A．mustn’tB．isn’t able toC．needn’tD．can’t
D
考查情態(tài)動詞。Can’t不可能，句意：瑪麗不可能在倫敦，因為我剛剛在商業(yè)區(qū)看到她了。
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