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    17．-What if he failed in the next monthly examination again？
    -I don't know．______ heart and be reduced _____ the class？（　　）
    A．Will he lose； not to attending
    B．Did he lose； to not attending
    C．Had he lost； not to attending
    D．Would he lose； to not attending

    分析 --如果他再次在月考中失败怎么办？
    --我不知道，他会灰心而沦落为不上学了吗？

    解答 答案：D．
    第一句话的if he failed in the next monthly examination again？是对将来的虚拟条件句，下文是对将来虚拟的主句，用would do，第二空be reduced to doing"沦落为做…"，to是介词，后面接动名词，not放在动名词前面，所以选D．

    点评 将来的虚拟条件句表示与将来事实相反：
    从句：Were to/should+动词原形   主句：Would/could/should/might+动词原形

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