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

It is said that more schools ________ in Linyi next year.

Nobody knows __________next

The road is designed for only motor vehicles, so once _____, bicycles are not allowed to go along it [ ]

It’s reported that more than 20 people have died of H7N9so far.—.

Unfortunately, I caught a bad cold and ached all _____ last night