—I wonder how much you charge for your services.—The first two are free the third costs $

发布时间：2020-08-17 09:21:18

—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

(答案→)A. while
B. until
C. when
D. before
解析：while是并列连词，表示对比，意为“而”。
以上问题属网友观点，不代表本站立场，仅供参考！