GWD-6-Q31:

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.

1. 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

2. 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

3. 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

4. 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

5. 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

大家请看D选项：with引独立主格， it is fact that ...强调it指代that从句，而且意思也对，为什么D不可？

 with sth doing and sth. doing, it is a fact that..., namely ....

其中an interesting and often overlooked feature of fraternal-twin pairs, namely a considerable variation on a spectrum of genetic relatedness 平行且很长，所以用it is a fact that.....

正常语序：with sth doing and sth doing, that ...namely ....is a fact.

大家请看D选项：with引独立主格， it is fact that ...强调it指代that从句，而且意思也对，为什么D不可？

 with sth doing and sth. doing, it is a fact that..., namely ....

其中an interesting and often overlooked feature of fraternal-twin pairs, namely a considerable variation on a spectrum of genetic relatedness 平行且很长，所以用it is a fact that.....

正常语序：with sth doing and sth doing, that ...namely ....is a fact.

大家请看D选项：with引独立主格， it is fact that ...强调it指代that从句，而且意思也对，为什么D不可？

 with sth doing and sth. doing, it is a fact that..., namely ....

其中an interesting and often overlooked feature of fraternal-twin pairs, namely a considerable variation on a spectrum of genetic relatedness 平行且很长，所以用it is a fact that.....

正常语序：with sth doing and sth doing, that ...namely ....is a fact.

我也选D，

但是主流是B

B中  应该这样理解

[QUOTE]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

 That （。。。）highlights an interesting and often overlooked feature of fraternal-twin pairs，highlights是动词，如何跟后面的and often overlooked feature of fraternal-twin pairs平行， overlooked 是形容词，搞不清楚，哪位高人帮帮

我觉得不能简单得说with＋复杂结构必错 OG上有三个with的结构 with food as a rarity/with arms and legs hanging/with crests that remain stationary

动词优于名词 vary>variation

C中 SVO结构完全改变

B中 S=that引导的句子 V=highlights O=feature