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    精英家教网 > 高中英语 > 题目详情
    1．Such a good opportunity，once ______，might never come again．（　　）
    A．lostB．to loseC．losingD．Loses

    分析 这样的好机会一旦失去了，也许再也回不来了．

    解答 答案是A．本题考查"连词+分词"的结构．"连词+分词"的结构在句中往往做状语，属于分词做状语；分词做状语时分词的选择是看分词和句子主语之间的关系：分词和句子主语之间是主谓关系（主动关系），用现在分词；分词和句子主语之间是动宾关系（被动关系），用过去分词；本题中连词once后的lose 和句子主语opportunity之间是被动关系，所以答案选择A．

    点评 首先判断选项中的动词在句中是以谓语还是非谓语形式出现，然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断．

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