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15、By the time he was twelve, Edison ________ to make a living by himself .

A. would begin     B. has begun    C. had begun    D. was begun

15、C

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By the time he was twelve, Edison _______ to make a living by himself.


  1. A.
    would begin
  2. B.
    has begun
  3. C.
    had begun
  4. D.
    began

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科目：高中英語 來源： 題型：

By the time he was twelve, Edison ________ to make a living by himself .

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