单项选择题

If I （） harder at school, I would be sitting in a comfortable office now.

A．worked
B．were to work
C．had worked
D．were working

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单项选择题
The phrase this wide, confused wilderness in paragraph 3 refers to （）.

A．personal experience
B．wild weeds among good plants
C．the information from the parents
D．the vast store of traditional practice
单项选择题
Britain has the highest （） of road traffic in the world -- over sixty cars for every mile of road.

A．popularity
B．density
C．intensity
D．prosperity
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