Mr Black be at home because she called me from England just now.
A. mustn't
B. isn't able to
C. can't
D. may not
网友回答
A. mustn't
B. isn't able to
(答案→)C. can't
D. may not
解析：此题重点考查情态动词的用法，句意：“布莱克先生不可能在家，因为刚才他从英国给我打电话了”这是肯定的猜测，“肯定不可能”因此用can’t，其余答案不合题意，故选C