OG补充Q46, 逗号的使用问题

f-hanes

Researchers have found that individuals who have been blind from birth, and who thus have never seen anyone gesture, nevertheless make hand motions when speaking just as frequently and in virtually the same way as sighted people do, and that they will gesture even when conversing with another blind person.

(A) who thus have never seen anyone gesture, nevertheless make hand motions when speaking just as frequently and in virtually the same way as sighted people do, and that they will gesture

(B) who thus never saw anyone gesturing, nevertheless make hand motions when speaking just as frequent and in virtually the same way as sighted people did, and that they will gesture

(C) who thus have never seen anyone gesture, nevertheless made hand motions when speaking just as frequently and in virtually the same way as sighted people do, as well as gesturing

(D) thus never having seen anyone gesture, nevertheless made hand motions when speaking just as frequent and in virtually the same way as sighted people did, as well as gesturing

(E) thus never having seen anyone gesture, nevertheless to make hand motions when speaking just as frequently and in virtually the same way as sighted people do, and to gesture

答案选A, 想问的是and who和and that前面为啥要有逗号? 前面既没有插入语也没有三个以上平行, 这种情况不多见.

医生吃鱼

我觉得这题逗号用得很清晰啊，who，and who，表示两个定语从句平行；that，and that表示两个宾语从句平行。

三个以上平行要用逗号，这句话我当初印象深刻，应该出自曼哈顿吧！不过后来发现GMAT不考平行中的逗号用法。