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    Only when class began ________ that he had left his book at home．

    [　　]
    A．

    will he realize

    B．

    he did realize

    C．

    did he realize

    D．

    should he realize

    答案：C
    解析：

    only 放在句首作状语，主句要用倒装语序，把助动词或情态动词提到主语前。A项时态不对。D项should也不正确。


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