问题
选择题
—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
答案
答案：A
搜题请搜索小程序“爱下问搜题”
—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
答案：A