Many species of animals which once lived on the earth are no longer in (exist) _

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问题 Many species of animals which once lived on the earth are no longer in (exist) ______ .

选项

答案 existence

解析本题考查动词的词形转换。介词in后应该跟名词，而exist是动词，所以应该填入其名词形式existence。

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