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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单项选择题

A:Good weekend?
B:（）

A. Yes.
B. Thank you.
C. No， thank you.
D. Excellent, thank you.

单项选择题

A.by
B.on
C.at
D.in

单项选择题

A. I’m afraid
B. With our compliments
C. To talk to the Manager
D. It is entirely our fault