All the classes in this school _________
题型：选择题
问题：
All the classes in this school _________ 60 students though they are of different ages。
A．are consisted of
B．consist of
C．is made upof
D．make up of
All the classes in this school _________ 60 students though they are of different ages。
A．are consisted of
B．consist of
C．is made upof
D．make up of