填空题

We always insist ______ payment ______ advance.

【参考答案】

on in
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______ reference ______ your order, we apologize for the delay.
单项选择题
Pearl plan to relocate to Peterborough so that ...
A. they can redevelop their London head office.
B. they can operate efficiently and keep costs low.
C. their products will be more competitive.
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