A．it; that B．one; veryC．that; that D．one; thatThe air o……

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

单项选择题I'm tired out. I ______ all afternoon and I don't seem to have finished anything.

单项选择题This area of the park has been specially ______ for children, but accompanying adults are also welcome.

单项选择题One of the few things you say about English people with certainty is that they ______ talk a lot about the weather.

单项选择题—Now that you like the house with a garden, why not buy it —Well, I can't afford （） house at present.

A. that expensive a
B. a such expensive
C. that an expensive
D. a so expensive