many species of animals which once lived on the earth( ) no longer in existence.
问题描述：
many species of animals which once lived on the earth( ) no longer in existence.
A.is B.are C.was D.were
答
many species of animals which once lived on the earth are no longer in existence species,单数和复数形式相同 例句：1 Most species provide good forage.（主语书复数 用are）2 This species provides good fo...