After seemed like hours a nurse wheeled Doris out of the emergency room.A. thatB. thereC

问题补充：

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

A. that

B. there

C. which

D. what

答案：

A. that

B. there

C. which

(答案→)D. what

解析：考查名词性从句。句中what在从句中作主语。句意：看起来像几个小时之后，护士推着Doris出了急救室。