单项选择题

No credit will be offered（）you place an order for more than 40.000 units.

A. after
B. when
C. if
D. unless

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A:Good weekend?
B:（）

A. Yes.
B. Thank you.
C. No， thank you.
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单项选择题

Mr. McNeil asked Mr. Don Bradley to ship the goods（）air.

A.by
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C.at
D.in