问GWD-6-Q31 关于because

gamxiaoyuan

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        (B)
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
这题的E选项破解上给的解释是：Because引导的是原因状语从句，而并不是名词性从句，使得this fact无所指，这个解释是什么意思呢？能否请大家指点下？

christonle

简单考虑，就是原句未给因果关系，不选E

ike982003

原因状语从句不能用this fact指代，也不能用任何代词指代。
名词和代词只能指代名词或名词性从句

gamxiaoyuan

多谢楼上两位

nemiah

B中的“That some fraternal twins resemble each other greatly while others look quite dissimilar” 是名词性从句作为主语从句吧？破解给的解释可以是针对这个来说的。