企源知识库

When I arrived at the hospital, he ( ) in the emergency room.
A、was being treated
B、were treated
C、had been treating
D、had been being treated
【正确答案】：A
【题目解析】：when 引导时间状语，表示主句和从句的动作同时发生，句子含义我到达医院时，他正在急救室接受治疗。