问题
选择题
—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
答案：D
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。
