题目内容

We confirm purchased 2,000 MP3 Players you.

A. have, to
B. having, from
C. to have, from
D. have been to

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All the information offered by you will be kept ____ confidential.

A. in
B. as
C. to
D. with

文献记载及考古研究表明，针灸术起源于（）时代。

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