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Long before the Europeans could make paper by themselves,the Chinese________paper in many ways.


  1. A.
    use
  2. B.
    used
  3. C.
    had used
  4. D.
    would use
C
分析:这里的long before后面带有一个从句,意思是“在某个事情之前很久的时候”,此处在before从句中是一般过去时(could make),因此所填的动词use就是“过去的过去”,应该用过去完成时。
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