(单选题)
—I wonder how much you charge for your services.
—The first two are free ______ the third costs ¥30.
A.before
B.until
C.when
D.while
参考答案:D
知识点:
(单选题)
—I wonder how much you charge for your services.
—The first two are free ______ the third costs ¥30.
A.before
B.until
C.when
D.while
参考答案:D
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