In Australia there are over 140 species of snakes,many of __are extremely dangerous.In Australia there are over 140 species of snakes,many of are extremely dangerous.A.them B.that C.which D.those为什么选C？

In Australia there are over 140 species of snakes,many of __are extremely dangerous.In Australia there are over 140 species of snakes,many of are extremely dangerous.A.them B.that C.which D.those为什么选C？
In Australia there are over 140 species of snakes,many of __are extremely dangerous.
In Australia there are over 140 species of snakes,many of are extremely dangerous.
A.them B.that C.which D.those
为什么选C？

In Australia there are over 140 species of snakes,many of __are extremely dangerous.In Australia there are over 140 species of snakes,many of are extremely dangerous.A.them B.that C.which D.those为什么选C？
非限制性定语从句,引导词在从句中作介词宾语,指代的是非人的 snake.必须用关系代词 which.

定语从句，后半句没有连词，所以是修饰前面某个名次的。

C
有不明白的地方再问哟，祝你学习进步，更上一层楼！ (*^__^*)