-– I wonder how much you charge for your services.The first two are free the third cos

发布时间：2020-08-17 11:24:11


-– 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

网友回答

A. while
B. until
C. when
D. before
解析：
While这里表示对比关系。这里考查连词引导的状语从句。
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