这句话是省略了定语从句的关系词吗?

题目

这句话是省略了定语从句的关系词吗?
Buyers and sellers should be aware of new developments in technology can and does affect marketing activities.
总觉得应该在can前加which,也就是应该写成：Buyers and sellers should be aware of new developments in technology which can and does affect marketing activities.

答案

new developments in technology can and does affect marketing activities是宾语从句,从句的主语是new developments in technology .can前没有省略.如果说省略,可以理解如下Buyers and sellers should be aware of...