问题

I wonder how much you charge for your services.– The first two are free ____ the third costs $30

A:while
B:until
C:when
D:before

正确答案是：

同类题型

Large quantities of meat ____ sold in that store at the present time.

Peter must be ill.It’s the only thing that can ________ his strange behavior.

The plant is dead. I ____ it more water.

_______ do you eat fruit and vegetables—–Every day.

What’s your name —________