2. 外语
  3. China’s economic reform is aimed at separating enterprises from the government. It has been implemented for almost 20 years, but

China’s economic reform is aimed at separating enterprises from the government. It has been implemented for almost 20 years, but

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问题 China’s economic reform is aimed at separating enterprises from the government. It has been implemented for almost 20 years, but breakthroughs ______.
选项 A、have been made yet
B、have yet to make
C、have yet to be made
D、to have yet made
答案C
解析 排除法：首先，根据句意，显然是说尚未取得突破，排除A；根据主动和被动关系可排除B、D两项。
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