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

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考题讲解

题目分析：
题目的开头是一个现在分词短语（Digging in sediments in northern China），句首出现的现在分词短语肯定是伴随状语。  

选项分析：

A选项：伴随状语中的现在分词的主语在语法上和其修饰的句子的主语相同，在本选项中，其主语为evidence。但是，在逻辑上，能挖出沉淀物的只能是“人”，而不能是“证据”。比较对象不对等。本选项than后面用了过去完成时，而过去完成时表达的是在某个过去时的过去，即，emerged的过去。但显然地，“科学家认为”这个事件不可能发生在emerge这个动作之前。

B选项：Digging的主语错误同(A)；本选项中suggest的宾语是一个名词短语（a much earlier emergence of complex life-forms），这是不正确的，suggest（表明）身后通常只能跟宾语从句。这点考查了“名词和从句的区别”。用之于本题，即：
evidence gathered by scientists suggests a much earlier emergence of complex life-forms
是不正确的。这是因为，证据表明的事情，通常是一个事实，而虽然“出现（emerge）”这个动作有终点，但是这个事实是一直存在的，即，事实不具有时间的概念，自然没有时间终止点。只能用宾语从句。
另外，比较对象错误同(A)。

C选项：Correct. 本选项在逻辑和语法上均是正确的。

D选项：suggest的宾语是一个名词短语（a much earlier emergence of complex life-forms）错误同(B)；比较对象不对等。that是代词，指代对象仅能是一个名词，而本题真正对比的应该是两种情况（真实情况vs科学家以前认为的情况）。

E选项：本选项错误同(D)。

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