单项选择题

The workers ______ a new hospital since the end of last year.

A. have built
B. have been building
C. had built
D. were building

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单项选择题

You'd better ______ some money for emergency , she told me.

A. set back

B. set about
C. set down

D. set aside

单项选择题

You should learn to take ______ of every opportunity to improve your oral English.

A) chance
B) use
C) action
D) advantage

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