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
科目：高中英語 來源： 題型：
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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