I had too much work to do last night. I didn't go to bed ___________ 11 o'clock.
A:at
B:until
C:for
D:In
下列文学常识说法不正确的一项是( )
人体营养需要是全面的,但对于青少年和伤病员,则应多食含( )
There are about five people in this city.