问题
选择题
The employment rate has continued to rise in big cities thanks to the efforts of the local governments to increase________. (2011·北京，34)
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答案
C
解析：句意为：由于当地政府(为增加就业率)所做的努力，大城市的就业率持续攀高。根据句意可知，本题中的代词应该指代上文提到过的名词the employment rate，根据代词的用法可知选项C正确。A项指代复数名词；B项指代可数名词复数；D项指代上文意思。