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She is a well­known doctor now, but she ________ as a cleaner at the hospital for five years.
A.has workedB.worked
C.had workedD.works
B
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。
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