A:1个
B:2个
C:3个
D:4个
找出类别不同一项。
① ____ A. three B. tree C. two
② ____ A. boy B. nine C. girl
________a teacher has given permission is a student allowed to enter the classroom.
1+1=____
下列句子中,划线的成语使用不恰当的一句是( )