题目内容
– 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
A
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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题目内容
– 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
A
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”