题文
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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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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