She is a well­known doctor now but she as a cleaner at the hospital for five years.

问题补充：

She is a well­known doctor now, but she as a cleaner at the hospital for five years.

A. has worked

B. worked

C. had worked

D. works

答案：

A. has worked

(答案→)B. worked

C. had worked

D. works

解析：B 考察动词时态。句意：她现在是一个有名的医生，但是以前她在那家医院里做了五年的清洁工。分析句子可知，她现在是医生，当清洁工是五年之前发生的事情，所以使用一般过去时，表示过去发生的事情。故B正确。