After _________ seemed like hours, a nurse wheeled Doris out of the emergency room.

A. that         B. there         C. which         D. what

 After ________ seemed like hours, a nurse wheeled Doris out of the emergency room.
A. that              B. what                  C. which               D. there

After _________ seemed like hours, a nurse wheeled Doris out of the emergency room.