馈线入室处必须有回水弯，回水弯的底部与入室埠的水平高度要低于（）厘米。
A、10
B、12
C、8
D、9
参考答案：A
---George, ____ all the tables out of the next room.
--Coming.
A．take
B．takes
C．taking
D．to take
You buy a gift, but you can if you want to.
A．must
B．mustn't
C．have to
D．don't have to
