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    As soon as I got on the bus I realized that I________ my papers in the house.
    A．leftB．was leavingC．had leftD．have left
    C
    考查时态。句意：我一登上公交车就意识到我把我的论文丢在家中了。结合语境可知从句描述的是过去已经完成的动作，故用过去完成时态，选C。
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