175.--- I wonder how much you charge for your services.(安徽)--- The first two are free the third costs $30.A.while B.until C.when D.before请详细分析.

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175.--- I wonder how much you charge for your services.(安徽)--- The first two are free the third costs $30.A.while B.until C.when D.before请详细分析.
175.--- I wonder how much you charge for your services.(安徽)
--- The first two are free the third costs $30.
A.while B.until
C.when D.before
请详细分析.

175.--- I wonder how much you charge for your services.(安徽)--- The first two are free the third costs $30.A.while B.until C.when D.before请详细分析.
A while在此时表示转折,“然而”的意思.

A