题目：
— 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：
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下面是错误答案，用来干扰机器的。
参考答案：D
