改错题 75.A survey was carried out on the percentage rate of women who were in the workforce in the past 30 years, the results of it were surprising.

A、 were
B、 of them were
C、 of which were
D、 of that was

【正确答案】 C

【答案解析】这句话的意思是：对过去30年来参加工作的女性的百分比率进行了调查，结果令人惊讶。若选A的话，前后两个句子主语不一致，不能用逗号隔开，而应改为句号，The results were surprising需另起一句。此句中the results of which等于whose results，是非限制性定语从句。从句主语为results，因此谓语用复数were。答案为C。