单项选择题

In recent years，the living standard of the Chinese people has been markedly improved．

A. 几年以后，中国人民明显地改进了自己的生活水准环境。
B. 近年来，中国人民的生活水平已经有了明显的改善。
C. 最近几年，中国人民的生活水准已经被明显提高了。
D. 最近，中国人民很快地提高了中国的生活水平标准。
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