A.Because people give too much time to the Internet.B.Because people have more friends

外语类 公共英语 已帮助 人

A.Because people give too much time to the Internet.

B.Because people have more friends on the Internet.

C.Because people have less face-to-face conversations than before.

D.Because people stay at home longer than before.

热搜:a是b的充分条件,b是a的必要条件吗