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    20、His father is a retired engineer in chief．He____in our steel plant almost for 40 years．

    A．has worked        B．had been working        C．worked         D．was working

    20、C

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    His father is a retired engineer in chief．He____in our steel plant almost for 40 years．

    A．has worked        B．had been working        C．worked         D．was working

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