He picked a textbook from the bookshelf and then commenced to read.A.directedB.commentedC.

外语类 公共英语 已帮助 人

He picked a textbook from the bookshelf and then commenced to read.

A.directed

B.commented

C.committed

D.began

热搜:a是b的充分条件,b是a的必要条件吗