问题
选择题
I think he must be in the office now, _____? [ ]
A. don't I
B. mustn't he
C. isn't he
D. can't he
答案
答案：C
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I think he must be in the office now, _____? [ ]
A. don't I
B. mustn't he
C. isn't he
D. can't he
答案：C