Sheisawellknowndoctornow,butsh

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

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---- I’m sorry, but we really can’t offer you the job if you haven’t get a higher education.
----- What a pity! I ______ hard at high school.

A．must have worked	B．should have worked
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