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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1178

Since the Obama administration took office, the China—US relations ________ positive development thanks to joint efforts of both sides, President Hu said at the Nuclear Security  Summit in Washington, April,12,2010.

A.witnessed B.were witnessed C.had witnessed D.have witnessed
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SincetheObamaadministrationtoo