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

发布时间：2020-08-17 11:46:38

– 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：这里起转折作用,while表示”但是”,可接句子.”前两个免费,但第三个要收费30元”
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