单项选择题

It's very informal here, you ______ wear a tie unless you want to.

A．don't have to
B．must not
C．could not
D．may not
<上一题 目录 下一题>
热门 试题

单项选择题
This is the place ______ I used to camp when I was younger.
A．what
B．when
C．where
D．which
单项选择题
When I got to the station the train ______ left.
A．already had
B．had already
C．has already
D．already has
相关试题