题目内容
-I wonder how much you charge for your service.
-The first two are free _________ the third costs $30.
[ ]
A.
when
B.
while
C.
as
D.
before
答案:B
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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.
when
while
as
before