中文谷---He
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问题详情：
---He___ be in the classroom, I think.
---No, he ___ be in the classroom. I saw him go home a minute ago.
A. can; may not B. must; may not
C. may; can't D. may; mustn't
【回答】
C
知识点：情态动词
题型：选择题
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