18、Over the past 30 years，China significant changes in comprehensive national strength thanks to the reform and opening-up policy．
A．witnessed B．were witnessing
C．has witnessed D．will have witnessed
18、C
科目：高中英語 來源： 題型：
Over the past 30 years，China significant changes in comprehensive national strength thanks to the reform and opening-up policy．
A．witnessed B．were witnessing
C．has witnessed D．will have witnessed
科目：高中英語 來源：2010屆高考英語二輪復(fù)習(xí)跟蹤測(cè)試：時(shí)態(tài)和語態(tài)專題 題型：單項(xiàng)填空
Over the past 30 years，China significant changes in comprehensive national strength thanks to the reform and opening-up policy.
A. witnessed B. were witnessing
C. has witnessed D. will have witnessed
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