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
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-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