A. discovered B. to be discovered C. discovering D. having discovered
单项选择题They used to quarrel a lot, but now they are completely ______ with each other.
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There is a ______ of impatience in the tone of his voice.
单项选择题The air of countryside is cleaner than ______ of city, but I don't like to live ______ far.
单项选择题We()on this project for four hours. Let's have a rest.