单项选择题

Which of the following aspects is not what an economic union concerns？（）

A.common currency
B.harmonized tax rates
C.harmonized tax rate structures
D.common political policy

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单项选择题
The suggestion that the CEO（）the prizes is welcomed by all.

A.would present
B.present
C.presents
D.ought to present
单项选择题
The words of the buyer left a（）impression on his mind.

a.long
b.lively
c.lasting
d.liberal
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