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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
C
解析:

試題分析:考查時態(tài)。By…到…為止;與完成時連用。后面接the time he was twelve是過去時,故主句中使用過去完成時。句意:到他12歲的時候,Edison已經(jīng)開始靠自己謀生了。故C正確。
考點:考查時態(tài)
點評:時態(tài)題中對by的考查是最關(guān)鍵的,by到…時為止;與完成時連用。
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