29．---- I wonder how much you charge for your services.---- The first two are free the th

发布时间：2020-08-15 03:11:03


29．---- 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：考查连词的用法。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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