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    【题目】Only when class began ______ that he had left his book at home.

    A. will he realizeB. he did realize

    C. did he realizeD. should he realize

    【答案】C

    【解析】

    考查倒装结构。当only等词谓语句首时，主句采用部分倒装，句意：直到上课开始时，他才意识到他已经把书丢在家里面了。结合语境可知此处描述的是过去的动作，故用过去时态，助动词用did，故选C。

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