GWD6-19

Q19:

The fact of some fraternal twins resembling each other greatly and others looking quite dissimilar highlights an interesting and often overlooked feature of fraternal-twin pairs, namely they vary considerably on a spectrum of genetic relatedness.

A.       The fact of some fraternal twins resembling each other greatly and others looking quite dissimilar highlights an interesting and often overlooked feature of fraternal-twin pairs, namely they vary considerably

B.       That some fraternal twins resemble each other greatly while others look quite dissimilar highlights an interesting and often overlooked feature of fraternal-twin pairs, namely that they vary considerably

C.       With some fraternal twins resembling each other greatly and others looking quite dissimilar, it highlights an interesting and often overlooked feature of fraternal-twin pairs, namely considerable variation

D.       With some fraternal twins resembling each other greatly and others looking quite dissimilar, it is a fact that highlights an interesting and often overlooked feature of fraternal-twin pairs, namely a considerable variation

E.        Because some fraternal twins resemble each other greatly and others look quite dissimilar, this fact highlights an interesting and often overlooked feature of fraternal-twin pairs, namely they vary considerably

Answer: 
                    B

我用的是涛涛GWD31，搜了好久都没有搜到答案~~~

题目好长，看得我眼晕晕~~~麻烦各位大侠不吝赐教阿~~~

句子结构: 

A) The fact of A and B highlights ...这个结构是有歧义的，因为可以理解为 the fact of A 和 B的并列，则higlights就不对了。

B) That A while B 是一个主语从句，表达的更清楚。

个人的一点看法，抛砖引玉。。。