It would be unfair to clone any extinct animals they were to live in a zoo
题型：不详难度：来源：
| It would be unfair to clone any extinct animals they were to live in a zoo. |
答案
| B |
解析
| 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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