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

I don’t remember____________ the book yesterday.

Look! Here ______ pictures of Beijing, China.

下列文学文化常识的阐释中不正确的一项是（）

is it from your home to the school — It’s about five miles.

r, it only appears in the imagination and willnever be ______