问题补充：
—Mr. Wang be in the office. The light is still on.
—No, he be. Because he phoned me from the farm just now.
A. may; mustn’t
B. mustn’t; mustn’t
C. can’t; can’t
D. must; can’t
答案：
A. may; mustn’t
B. mustn’t; mustn’t
C. can’t; can’t
(答案→)D. must; can’t
解析：考查情态动词表推测。must表推测用于肯定句当中，can表推测用于疑问或否定句中。所以答案选D。
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