对于than后面加不加代词总是很迷惑

御坂西瓜

OG13的题
65.Digging in sediments in northern China, evidence has been gathered by scientistssuggesting that complex life-forms emergedmuch earlier than they hadpreviously thought

(A) evidence has been gathered by scientistssuggesting that complex life-forms emergedmuch earlier than they had

(B) evidence gathered by scientists suggests amuch earlier emergence of complex life-formsthan had been

(C) scientists have gathered evidence suggestingthat complex life-forms emerged much earlierthan

(D) scientists have gathered evidence that suggestsa much earlier emergence of complex life-formsthan that which was

(E) scientists have gathered evidence whichsuggests a much earlier emergence of complexlife-forms than that

像这样的总是不懂到底要不要加代词，这题是后面的省略了life-forms么？

jeffery2541

同学 你的问题指的是哪个选项呢 或者问的在具体点吧