31.By the time I got to school, I realized I my backpack at home. A.left B.had left C.has left D.had forgotten 查看更多

 

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By the time I got to school, I realized I ________ my backpack at home.


  1. A.
    left
  2. B.
    had left
  3. C.
    was leaving
  4. D.
    had forgotten

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By the time I got to school, I realized I __________________my backpack at home.

A.left        B.had left         C.has left          D.had forgotten

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