GWD8-30

GWD-8-Q30:

While studying the genetic makeup of corn, a new class of mutant genes was discovered by Barbara McClintock, a discovery which led to greater understanding of cell differentiation.

1. a new class of mutant genes was discovered by Barbara McClintock, a discovery which led

2. a new class of mutant genes in corn were discovered by Barbara McClintock, leading

3. Barbara McClintock discovered a new class of mutant genes, and it led

4. Barbara McClintock discovered a new class of mutant genes, a discovery that led

5. Barbara McClintock, who discovered a new class of mutant genes, leading

 这道题答案选D。但是D当中discovery 成了mutant genes的同位语了？？

还有就是到底是Barbara McClintock lead to greater understanding of cell differentiation 还是discovery 发出的lead 的这个动作呢？

恳请各位指点!

我觉得这里discovery 是形容整个前半句

discovery 发出的lead 的这个动作

同样的感觉阿，第一感觉是D但是怎么在前半句也找不到同位语对应的名词，晕啊

可以指代前面的句子或者某一个动词（discover）转换的名词吗? 哪位帮忙解释一下啊？

ps：GWD汇总贴里面没有这个题目，看来大家都没有什么疑问嘛