of whom two-thirds与two-thirds of them的区别

There are two thousand students in our school, _____are girls.

A. of whom two-thirds B. two-thirds of them

C. two-third in them D. two-thirds which

老师，这题答案是A，我选了B。我不明白这题为啥A是正确呀？麻烦老师帮忙讲解。

谢谢。

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分类：数词用法

最佳答案 2015-08-26 22:42

There are two thousand students in our school, _____ are girls.

A. of whom two-thirds

B. two-thirds of them

C. two-third in them

D. two-thirds which

▲ 该题的测试目的有两个内容：1.分数表达法； 2.定语从句。

第一个问题不用解释了。第二个问题的关键是，school后面是个“逗号”，不是句号或分号。这说明句子还没完，意味着后面是一个定语从句（非限制性定语从句）。

以下表达都正确，请仔细体会为什么？

1. There are two thousand students in our school. Two-thirds of them are girls.

2. There are two thousand students in our school; two-thirds of them are girls.

3. There are two thousand students in our school and two-thirds of them are girls.

4. There are two thousand students in our school, and two-thirds of them are girls.

5. There are two thousand students in our school, of whom two-thirds are girls.

6. There are two thousand students in our school, two-thirds of whom are girls.

▲ 句1加句号，是两个单句。

句2加分号，表示两个分句。

句3加and，表示两个并列句。

句4多了一个逗号表停顿，跟句3相同。

句5，非限制性定语从句，of whom在前表所属关系，“他们中的”三分之二。

句6，非限制性定语从句，of whom在后表所属关系，“他们中的”三分之二。

▲ them 跟whom 的区别是：前者是人称代词，指代前面提到的名词，但不能充当关系代词引导定语从句。具体地说，前句后面是个逗号，而没有and，这时就要小心了：后面的句子很可能是一个定语从句，在many of, some of, one of, two-thirds of 等这些词组后, 就要用whom了。