题目内容

---There _____ anybody in the room.
--- Why do you say so?
--- Because the door is locked.
A．must not beB．can’t haveC．can’t beD．may not be
C
考查情态动词表推测的用法。must表推测用于肯定句中，可排除，can表推测用于疑问句或否定句中，may表示可能性的推测，根据答语的内容可知是绝对否定的回答，是对现在事情的推测，故选C
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