many people were sitting on the bench __ __ the doctor A seeing B for seeing C saw D to see

问题描述:

many people were sitting on the bench __ __ the doctor A seeing B for seeing C saw D to see
要原因

应该是seeing,虽然有点别扭.

many people were sitting on the bench seeing the doctor.
it means:many people were sitting on the bench, they were seeing the doctor.