求教OG15 SC-65

香蕉chasedream

Digging in sediments in northern China, evidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had previously thought.

• Aevidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had  分析A选项
• Bevidence gathered by scientists suggests a much earlier emergence of complex life-forms than had been  分析B选项
• Cscientists have gathered evidence suggesting that complex life-forms emerged much earlier than  分析C选项
• Dscientists have gathered evidence that suggests a much earlier emergence of complex life-forms than that which was  分析D选项
• Escientists have gathered evidence which suggests a much earlier emergence of complex life-forms than that  分析E选项这道题选C答案没什么问题，就是自己想不明白如何把than后面省略的内容补充完整呢？这句话比较的内容是什么呢？     先谢谢回答的大神们~
  

香蕉chasedream

第一次发帖   排出来的版好恶心  我把题重新发一下

Digging in sediments in northern China, evidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had previously thought.

evidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had
evidence gathered by scientists suggests a much earlier emergence of complex life-forms than had been  
scientists have gathered evidence suggesting that complex life-forms emerged much earlier than  
scientists have gathered evidence that suggests a much earlier emergence of complex life-forms than that which was  
scientists have gathered evidence which suggests a much earlier emergence of complex life-forms than that  

香蕉chasedream

没有大神吗

yangdi05

省略的应该是时间吧，much earlier than the time previously thought