The Internet is a wonderful discovery,__________ of great significance to people’s lives.A.which I think\x05\x05\x05B.which I think it is\x05C.as I think \x05\x05D.as is I think为什么选A think后为什么没有is

The Internet is a wonderful discovery,__________ of great significance to people’s lives.A.which I think\x05\x05\x05B.which I think it is\x05C.as I think \x05\x05D.as is I think为什么选A think后为什么没有is
The Internet is a wonderful discovery,__________ of great significance to people’s lives.
A.which I think\x05\x05\x05B.which I think it is\x05C.as I think \x05\x05D.as is I think
为什么选A think后为什么没有is

The Internet is a wonderful discovery,__________ of great significance to people’s lives.A.which I think\x05\x05\x05B.which I think it is\x05C.as I think \x05\x05D.as is I think为什么选A think后为什么没有is
which引导的定语从句,修饰a wonderful discovery,从句若还原成正常语序为I think which of great significance...这个从句的结构如下：I （主语）think（谓语）which（宾语） of great significance...（宾补）,明白了吗?I think后面并不是一个从句,而是of great significance...整个作which的补语.其实think后面加is并没有错的,那就成了I think后面跟一个宾语从句了.但是你得按题目意思来.