【单选题】

China's economic reform is aimed at separating enterprises from the government. It has been implemented for almost 20 years, but breakthroughs ______.
A．have been made yet

B．have yet to make
C．have yet to be made
D．to have yet made

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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

18%的考友选择了B选项

81%的考友选择了C选项

1%的考友选择了D选项

China's economic reform is aimed at separating enterprises from the government. It has been implemented for almost 20 years, but breakthroughs ______.A．have been made yet