单项选择题

The air in ______ big cities in the world used to be very dirty.

A. so a few
B. too a few
C. a very few
D. quite a few
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单项选择题
It was said that all the ______ machines had been repaired.
A. damaging
B. damaged
C. new
D. stored
单项选择题
______ such a good chance, how could she let it slip away
A. Having given
B. Giving
C. Having been given
D. Given
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