We Haven't studied Unit 6 _ A.yet B.ever C.alrrady D.just

问题描述:

We Haven't studied Unit 6 _ A.yet B.ever C.alrrady D.just
请问选哪个?为什么?非诚勿扰

A.yet
一般用于完成时否定
yet[英][jet] [美][jɛt]
adv.但是;还;已经;又,再
conj.然而,但是