求助语法2道谢谢解答

52074653UID: 2118284

The Mycenaen people entered ancient Greece and established the Helladic culture, that can be divided into three periods.  


题目给的答案是D， 为什么？谢谢，记得SAT里面逗号后面也能用that 代替which..不像是在我们中学里面学的只能用which,。。是我弄错了？ 大家看看，谢谢
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The white dwarf, a type of star who is unusually faint, has a mass equivalent to that of the Sun even though the white dwarf is approximately the same size as Earth.

题目答案是A，当然应该把 who改成which, 但是D答案为什么不用写成 that of Earth,表示SIZE， 因为前面比较质量的时候都写了  that of the Sun ，谢谢解答

52074653UID: 2118284

顶一下。

amyceresUID: 2206721

that不可以代替which
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这里主语是WD不是the size of WD

water0915UID: 2222422

has a mass equivalent to that of the Sun
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- L* I% ]5 W" r: _# o; a8 n8 w, omass compare to mass of sun

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BTW: how to distinguish the use of that and which? which is used for non-essential parts?

杀生玲UID: 2204304

同意三楼。。。