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
while是并列连词，表示对比，意为“而”。
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
while是并列连词，表示对比，意为“而”。