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It is said that the early European playing-cards ______ for entertainment and education.


  1. A.
    were being designed
  2. B.
    have designed
  3. C.
    have been designed
  4. D.
    were designed
D
解析:
early暗示該空表示“過去被設(shè)計”,應(yīng)填一般過去時被動語態(tài)動詞形式were designed。
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