英语完形填空,

问题描述:

英语完形填空,
如题,
These comics are often made into cartoons_are watched by millions of people in Asia,Europe and American.
A which B so C they D what
这句话应怎样填选项?是什么从句?

A which
which ===cartoons.which是定语从句的连接词,也是做从句部分的主语.