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) who had no formal medical training, struggled against overwhelming odds to become
答案是E.
D与E该如何理解？？ 我总觉得E中 to become 是错的，不定式用在这里不是表达目的性的吗？感觉不符合句子的意思！
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