案例分析题非英语专业做 Britain was a wealthy country a hundred and fifty years 61 . There were a 62 very rich people 63 received money form land or investment， and did not need to work. They used to have large 64 of servants to look 65 them. There were also many middle class people， who worked as businessmen or as doctors or lawyers. They usually had several servants to 66 their houses and cook their meals. But there were also many poor people， and there was a big 67 between the rich and the poor. The poor had very difficult lives. Many worked as servants. They used to be 68 little， and they had to work long hours. But at least they lived in warm house and were well 69 . 70 who worked in factories were often less 71 . They used to work many hours a day， in dangerous and unhealthy conditions. But， even so， they did not use to 72 enough to feed their families. They often lived in slums which were built cheaply by the factory owners. The 73 paid people were those who worked 74 the farms. At certain times of the year， they did not use to earn 75 because there was no work 76 them to do. Life for the poor was not always bad. There were kind farmers and factory owners who helped their workers. And many people were 77 about the poor. One of them was Charles Dickens， the famous British writer. When he was young， his family was always short 78 money. His father was a clerk ，who used to 79 more than he earned. When Dickens was eleven， his father was 80 to prison， and Dickens had to work in a factory. At this time， very young children used to work in factories and mines， and clean chimneys. 66应该选择（）

A. clear
B. clean
C. sweeten
D. declare