单项选择题

There are 20 blanks in the following passage, and for each blank there are 4 choices marked. A, B, C and D at the end of the passage. You should choose ONE answer that best fits into the passage. Then mark the corresponding letter on the Answer Sheet with a single line through the center.
The role of women in Britain has changed a lot in this century,_(56) _in the last twenty years. The main change has been_(57) _giving women greater equality with men._ (58) _to the beginning of this century, women seem to have had_(59) _rights. They could not vote and were kept at home._(60) _, as far as we know, most women were happy_(61) _this situation. Today, women in Britain certainly_ (62) _more rights than they used to. They were_ (63) _the vote in 1919. In 1970 a law was passed to give them an equal_(64) _of wealth in the case of divorce,_(65) _the Equal Pay Act gave them the right_(66) _equal pay with men for work of equal value in the same year. Yet_(67) _these changes, there are still great difference in status between men and women. Many employers seem to_(68) _the Equal Pay Act, and the average working women is_ (69) _to earn only about half_(70) _a man earns for the same job._ (71) _a survey, at present, only one third of the country’s workers are_(72) _women. This small percentage is partly_(73) _a shortage of nurseries. If there were_(74) _nurseries, twice as many women_(75) _go out to work.

56().