关于熏衣紫草总结的一个问题．

在熏衣紫草的总结中说

平时复习SC的方法绝对不是考试时做题的方法. 平时字斟句酌就是为了培养一种条件反射的能力, 到考试时迅速排除.
                我模考做GWD语法的平均时间不会超过30秒一题. 前10题里的语法我会故意放慢速度, 逐一看过, 但到后面, 特别是20题以后, 不会多于30秒. 考试时候的方法就是前3词, 尾3词, 再中间. 很多题目都可以靠这6个词解决, 大概只要20秒, 因为分别2/3split以后就只剩下一个了.  下面我举一个比较有代表性的例子:

GWD24-13

Vivien Thomas, who had no formal medical training, in struggling against overwhelming odds, he became a cardiac surgeon and eventually to receive an honorary doctorate from Johns
                        Hopkins
                        University.

A) who had no formal medical training, in struggling against overwhelming odds, he became

B) having had no formal medical training, in struggling against overwhelming odds to become

C) who, having no formal medical training, he struggled against overwhelming odds in becoming

D) who, having had no formal medical training and struggled against overwhelming odds, became (E)

E) who had no formal medical training, struggled against overwhelming odds to become

这道题上来就可以用having排除BCD, 而A后面又重复主语引起一个新的句子(我把它称之为”主语缀述”). 这道题对我而言, 10秒之内就可以解决. 当然, 如果不放心, 仔细看可以发现A前半句的结构dangling, 但我不会过多纠缠, 一般如果能靠6词确定就move on, 不行再看中间. 我在考场上做的语法题, 特别是前面的, 都很长, 我基本上都在30秒解决 (前10题除外). 其实语法点就那些, again, 把信息简化. 看透出题思路, 靠排除
                对症下药. 当然,  这样的方法总会有例外, 但我觉得花再多的时间也许可以找出为数不多的错误, 但margin不高. 很幸运的是, 我考试的题目没有特别反常规的思路.

我的问题:还是不太明白她的意思．　看上去她没有读提干，就是直接答案排除哦．请ＮＮ可以帮忙ＣＬＥＲＩＦＹ一下

A,C主语赘述

B.typical run-on sentence

D. violate the parallelism

Vivien Thomas, who had no formal medical training, in struggling against overwhelming odds, he became a cardiac surgeon and eventually to receive an honorary doctorate from Johns
                    Hopkins
                    University.
                    

A) who had no formal medical training, (in struggling against overwhelming odds, )he became 摇摆+重复主语

B) having had no formal medical training, in struggling against overwhelming odds to become
                    

C) who, having no formal medical training, he struggled against overwhelming odds in becoming
                    

D) who, having had no formal medical training and struggled against overwhelming odds, became (E)
                    

E) who had no formal medical training, struggled against overwhelming odds to become
                    

我觉得错.

"摇摆"就是dangling,就是该结构可以modify前面,也可以modify后面,不是重复主语.

what is run -on sentence? why it's wrong