[单选题]We should be pleased to send you some samples of our new typewriter on approval, ______ our own expense.
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2023-09-29 20:10:00
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[单选题]We should be pleased to send you some samples of our new typewriter on approval, ______ our own expense.

A.at
B.on
C.for
D.in
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国家开放大学

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