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    精英家教网 > 高中英语 > 题目详情
    It would be unfair to clone any extinct animals       they were to live in a zoo.
    A．orB．ifC．butD．whether
    B
    本题考查连词。Or否则；if如果；but但是；whether是否。根据题意可知句中运用虚拟语气，故用if引导。选B。
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