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    精英家教网 > 高中英语 > 题目详情
    Tourism, _______ it brings in money to a country, can also result in damage to the World 
    Heritage sites there.         
    A．once B．whileC．ifD．as
    B

    试题分析：A. once一旦，B. while虽然，当…时候，然而，C. if如果，D. as正如，句意：--旅游业虽然给一个国家带来收益，也会给这里的世界遗产带来破坏。所以选B。
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