GWD6-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.
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
C选项，it指代不明，而且句中没有任何名词能代替it。
D选项 considerable 一般是修饰抽象名词的，比如 time， money， attention, 所以 a considerable variation i不恰当;some fraternal twins resembling each other greatly and others looking quite dissimilar 在原文意思就是指fact，用 with结构+it is a fact that 是不准确的而且繁琐的：感觉with。。。。伴随的一个fact, 但其实with后面的话就是fact。
不知道你明白我的解释没？作者: secretsoft 时间: 2013-6-20 06:35
希望对你有帮助哈作者: wwc008love 时间: 2013-6-22 06:48
多谢多谢哈， 明白了！作者: Knightll 时间: 2013-6-25 05:56
mark一下。it is the fact that ＋陈述事实。D把要陈述的事实变成了With伴随成分，逻辑重心转移。看原句The fact of some fraternal twins resembling each other greatly and others looking quite dissimilar highlights。。。。。。主语逻辑重心在所描述的事实上。D把主语变成伴随状语了。改句子首先要尊重原句意思。OG里说的。作者: trendysx 时间: 2013-6-25 19:20
mark一下
1 namely不是连词
2 that引导的名词从句，受教了
补充一点：the fact of 的句式在gmat中压根就没正确过，全部粗线在错误的选项
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