—Mr. Wang be in the office. The light is still on.—No he be. Because he phoned me from

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。