Tony  ____ for the company as an engineer for two decades. Now he teachesmechanics m Peking University.
A．has workedB．workedC．is workingD．had worked
B

試題分析：考查動詞的時態(tài)。句義：唐妮在這個公司做工程師做了20 年，現(xiàn)在她在北京大學(xué)教力學(xué)。前句是說明她的過去的工作經(jīng)歷，后句是說明她現(xiàn)在的工作。所以前句應(yīng)該用一般過去時，所以B正確。
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