问题
选择题
Look! The light in the room is still on. Mr. Liu at work.[ ]
A. must
B. can't be
C. must be
D. have to be
答案
答案：C
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Look! The light in the room is still on. Mr. Liu at work.[ ]
A. must
B. can't be
C. must be
D. have to be
答案：C