单项选择题

We （） on this project for four hours. Let's have a rest.

A. are working
B. have been working
C. worked
D. had worked

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There is a ______ of impatience in the tone of his voice.
A. dot



B. hint
C. notion
D. phrase
单项选择题
The air of countryside is cleaner than ______ of city, but I don't like to live ______ far.
A．it; that



B．one; very
C．that; that


D．one; that
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