问题描述：
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.
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.
问题解答：
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