单项选择题
（）the War of Independence, the United States was an English colony.
A.Before B.At C.In D.Between
单项选择题 （）she seemed to find English very difficult, but later he made very good progress.
单项选择题 （）he was tired he went on working.
单项选择题 （）did he know what had happened during the two months when he was away
