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It would be unfair to clone any extinct animals       they were to live in a zoo.
A．orB．ifC．butD．whether
B
本題考查連詞。Or否則；if如果；but但是；whether是否。根據(jù)題意可知句中運用虛擬語氣，故用if引導(dǎo)。選B。
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