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

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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。