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：這里的long before后面帶有一個(gè)從句，意思是“在某個(gè)事情之前很久的時(shí)候”，此處在before從句中是一般過去時(shí)(could make)，因此所填的動詞use就是“過去的過去”，應(yīng)該用過去完成時(shí)。
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