题目内容
-I wonder how much you charge for your service.
-The first two are free ________ the third costs $30.
[ ]
A.while
B.until
C.when
D.before
答案:A
练习册系列答案
相关题目
题目内容
-I wonder how much you charge for your service.
-The first two are free ________ the third costs $30.
A.while
B.until
C.when
D.before