y , on,
in, with
at
C
A
what
B
B
No, I didn't
Did she buy a beautiful sweater?
Don't speak in the class.
There are many books on the class.
划线部分是哪?是9o'clock吧
What time do you go to bed
如果对I 提问, who goes to bed at 9 o'clock?
如对 go to bed提问, what do you do at 9 o'clock?