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By the time he________five，he________a lot of performances．


  1. A.
    was，had given
  2. B.
    had been，had given
  3. C.
    was，gave
  4. D.
    had been，gave
A
分析：過去完成時表示“過去的過去”，即“過去某一時間之前所發(fā)生的事”，此處“by+過去時間”表示“到過去那點時間為止”，by the time后面所跟的從句，表示了time的具體時間，應該用一般過去時表示，had given是發(fā)生在by the time he wasfive之前的，要用過去完成時。(延伸)by+過去時間有下面幾種情況：1)by the time+含有過去時的一個從句，如：By the time my mothercame back home，I had got the supper ready．2)by+過去的一點時間，如：By five o'clock yesterday afternoon，I had finished my homework．3)by+過去的一段時間，如：By last term we had learned two thousand words．(到上學期為止，我們已經學了二千個單詞)(包括不包括上學期很模糊)4)by the end of last month(到上月底為止)，by the beginning of last month(到上月初為止)，by the middle of last month(到上月中為止)，of后面必須跟一段時間，不能跟一點時間，不能說by the end of five o'clock，只能說by
five o'clock．5)by the age of eight(到8歲時為止)
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