there are 39 students in my class in all,21 (of which) are girls.为什么不能用 of them?

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there are 39 students in my class in all,21 (of which) are girls.为什么不能用 of them?

there are 39 students in my class in all,21 (of which) are girls.为什么不能用 of them?
there are 39 students in my class in all,21 (of which) are girls.为什么不能用 of them?

there are 39 students in my class in all,21 (of which) are girls.为什么不能用 of them?
不是 of which, 应该是 of whom.
如果用of them 就不知道是什么句子类型了.因为句中无连词.


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这里是作定语从句, 它与前面的主句是主从关系.
如果在21前面加个and,就填of them.:
There are 39 students in my class,and 21 of them are girls.

这里是非限定性定语从句,如果用them, 逗号前后都是完整的独立的句子,这样中间必须要有连词and连接的,既然这句子中没有and,后边的就要用定语从句, 21 of which are girls 用来修饰39 students!
希望您满意!