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 考察動詞時態(tài)。句意：她現(xiàn)在是一個有名的醫(yī)生，但是以前她在那家醫(yī)院里做了五年的清潔工。分析句子可知，她現(xiàn)在是醫(yī)生，當(dāng)清潔工是五年之前發(fā)生的事情，所以使用一般過去時，表示過去發(fā)生的事情。故B正確。
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