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
