问题
选择题
It is _____ to come into the teacher's office without his permission. [ ]
A. bad manner
B. a manner
C. manners
D. bad manners
答案
答案：D
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It is _____ to come into the teacher's office without his permission. [ ]
A. bad manner
B. a manner
C. manners
D. bad manners
答案：D