單項(xiàng)選擇題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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1.單項(xiàng)選擇題
A:Good weekend?
B:（）
A. Yes.
B. Thank you.
C. No， thank you.
D. Excellent, thank you.
2.單項(xiàng)選擇題Mr. McNeil asked Mr. Don Bradley to ship the goods（）air.
A.by
B.on
C.at
D.in
