A.The students attended class twice a week.B.Men were quite active during the classes.

外语类 公共英语 已帮助 人

A.The students attended class twice a week.

B.Men were quite active during the classes.

C.Dennis and James were great friends,

D.The teacher was not supposed to assign homework.

热搜:a是b的充分条件,b是a的必要条件吗