题目内容
–I wonder how much you charge for your service.
--The first two are free____ the third costs $30.
| A.before | B.as | C.when | D.while |
D
解析
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题目内容
–I wonder how much you charge for your service.
--The first two are free____ the third costs $30.
| A.before | B.as | C.when | D.while |
D
解析