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.

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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

请教B项的结构，highlights．．．and．．overlooked，为什么时态不一致．还有，namely that they vary considerably什么意思，充当什么成分？

thanks

这个题目的答案是什么？ 我就蒙B了

怪怪的

highlights an (interesting and often overlooked) feature

括号里面的作为定语修饰feature

namely that ... 作为同位语成分 namely是一个副词 意思是 即 。。。 比方说 ，Only one person can go, namely Tony. 只有一个人能走，即Tony

that作为前面that从句的同为结构 即主句中有that从句，同为结构用that ....

整句话的意思是 异卵双生中有些和对方很像而有些则差别很大强调了一个很有趣但却时常被忽略的异卵双生的特征问题，即他们（不同的异卵双生）在基因相关性的差别是非常大的

这题我碰到2次，没细看，一看就是B，A FACT后边没接THAT，CDE前几个词一看就不爽。。。

解答一下：

That some fraternal twins resemble each other greatly while others look quite dissimilar 主语，因为是个长句，所以必须前面加THAT的

highlights （谓语动词）

an interesting and often overlooked （这个OVERLOOKED是过去分词作为修饰后面feature的，和interesting 平行的)

feature of fraternal-twin pairs,

namely that they vary considerably（补充状语从句，对前面整个句子进行补充） ........