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    1．-Mom，can I go to the zoo with Linda？-Sorry，you can't____ you haven't fully recovered from your flu．（　　）
    A．untilB．beforeC．asD．unless

    分析 --妈妈．我可以和Linda去动物园吗？
    --抱歉，你不能去，因为你的感冒还没有完全康复．

    解答 答案：C．根据you haven't fully recovered from your flu可知由于你的感冒还没有完全康复，所以你不能去，两句之间是因果关系，所以答案是C as"因为"．其他选项的含义分别是A"直到"；B"在…之前"；D"除非"．

    点评 考查从属连词． as用作连词引导原因状语从句
    　　as，because，since都可以表示因果关系，连接原因状语从句，含义是"因为，由于"，但它们有区别：because表示的语气最强；as一般放在句首，语气较弱，较口语化；since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作"既然"．例如：
    　　（1）He will succeed because he is in earnest．他一定会成功，因为他很认真．
    　　（2）Since you are so sure of it he"ll believe you．既然你对此如此有把握，他会相信你的．
    　　（3）As rain has fallen，the air is cooler．因为下过雨，空气比较清爽．

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