问题
选择题
The light is on in Mr. Green's room. He _______ be at home. [ ]
A. must
B. can
C. mustn't
D. can't
答案
答案：A
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The light is on in Mr. Green's room. He _______ be at home. [ ]
A. must
B. can
C. mustn't
D. can't
答案：A