单项选择题

Our slogan is "Quantity should never be increased at the () of quality".

A. price
B. cost
C. value
D. wealth

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单项选择题
Let's ask him for help, ().

A. don't we
B. shall we
C. have we
D. haven't we
单项选择题
This is a very () situation and we don't know how to face it yet.

A. comprehensive
B. compound
C. complicated
D. competent
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