請問一題閱讀 - 英檢

擷取一段文章如下：

The coralline structures that are created through these complicated

processes are extremely variable in form. They may, for example, be

treelike and branching, or they may have more rounded and compact shpes.

What they share in common, however, is the extraordinary variety of plant

and animal life-forms that are a necessary part of the ongoing process

of their formation.

因為這一題自己怎麼看都看不懂答案為什麼是這一個，所以特地來PO版問大家
希望有高手可以解惑，謝謝。

題目：
The word "their" in paragraph 6 refers to
A) coralline structures
B) complicated processes
C) rounded and more compact shapes
D) plant and animal life-forms



















答案是 A




我的問題是，以往我判別主詞的時候，都是直接找那一句，所以就直接從
what 那一句開始看起，根本就沒有從最一開始的coralline看，所以答案自然不對

另外我想要問的是，要如何判別that借代的是主詞還是受詞呢？
如果他是問who 或 which 是指誰或什麼東西，我還可以找出來，可是一問that
我就會在主詞跟受詞之間很猶豫，感覺帶進去念起來也通阿

有沒有人可以教我怎麼辨別阿，感激不盡～


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