题目内容

Tom realized that he ________ his physics book at home when he reached school.


  1. A.
    left
  2. B.
    had left
  3. C.
    was leaving
  4. D.
    leaves
B
本题考查过去完成时的用法,由had+过去分词。我们可以看到意识到和到都是过去的动作,而忘记带物理书则是在意识到之前,故为过去的过去,选B。
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