【求OG13语法详细分析,FossilsofthearmofaslothfoundinPuertoRicoin1991,anddatedat34millionyearsold,madeittheearliestknownmammaloftheGreaterAntillesIslands.(A)slothfoundinPuertoRicoin1991,anddatedat34million】

　　求OG13语法详细分析,

　　FossilsofthearmofaslothfoundinPuertoRicoin1991,anddatedat34millionyearsold,madeittheearliestknownmammaloftheGreaterAntillesIslands.

　　(A)slothfoundinPuertoRicoin1991,anddatedat34millionyearsold,madeittheearliestknownmammalof

　　(B)sloth,thattheyfoundinPuertoRicoin1991,hasbeendatedat34millionyearsold,thusmakingittheearliestmammalknownon

　　(C)sloththatwasfoundinPuertoRicoin1991,wasdatedat34millionyearsold,makingthistheearliestknownmammalof

　　(D)sloth,foundinPuertoRicoin1991,havebeendatedat34millionyearsold,makingthesloththeearliestknownmammalon

　　(E)slothwhich,foundinPuertoRicoin1991,wasdatedat34millionyearsold,madethesloththeearliestknownmammalof