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.
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
答案选D。 但是为何C错了呢? Barbara McClintock发现的是a new class of mutant genes,这应该也能用it来指代吧。。我觉得D中DISCOVERY应该是一件事情,不如it好吧。。