Tom realized that he ________ his physics book at home when he reached school．
A．leftB．had leftC．was leavingD．leaves
B

本題考查過去完成時(shí)的用法，由had+過去分詞。我們可以看到意識(shí)到和到都是過去的動(dòng)作，而忘記帶物理書則是在意識(shí)到之前，故為過去的過去，選B。
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