题目信息
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.
A:a new class of mutant genes was discovered by Barbara McClintock, a discovery which led
B:a new class of mutant genes in corn were discovered by Barbara McClintock, leading
C:Barbara McClintock discovered a new class of mutant genes, and it led
D:Barbara McClintock discovered a new class of mutant genes, a discovery that led
E:Barbara McClintock, who discovered a new class of mutant genes, leading
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正确答案：
D:Barbara McClintock discovered a new class of mutant genes, a discovery that led
A. While studying状语从句的省略在句首，studying的逻辑主语为句子主语，执行studying动作的应该是人，a new class of mutant genes错误；要用that引导限制性定语从句。
B. 逻辑主语错误同A。leading在句尾做伴随结果，逻辑主语Barbara McClintock错误。
C. it无法指代前面整句因此无指代对象，最好用同位语。
D. correct。A discovery作为同位语指代前句，that指代a discovery，并且同位语从句里的that不省略。
E. studying的逻辑主语正确，who…genes作为插入语出现；整个句子缺少谓语动词
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