He in the factory for three years before he joined the Army.A has worked B works C had worked Dwill work

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HeinthefactoryforthreeyearsbeforehejoinedtheArmy.AhasworkedBworksChadworkedDwillworkHeinthefactoryfo

He in the factory for three years before he joined the Army.A has worked B works C had worked Dwill work
He in the factory for three years before he joined the Army.
A has worked B works C had worked Dwill work

He in the factory for three years before he joined the Army.A has worked B works C had worked Dwill work
选C
过去完成时,joined以表明是过去的了,for three years 所以要用完成时
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C

C 他在参军之前在工厂工作过3年
参军(joined)是过去式,在这3年前应该用过去完成时

选择C 。因为 before 指在。。。之前,而他参军所用的是过去时态,那么他在工厂工作比参军还要早,并已完结,所以应该用过去完成时态。had+动词过去式。