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
祝你学习愉快,谢谢
He in the factory for three years before he joined the Army.
He in the factory for three years before he joined the Army.
A has worked B works C had worked Dwill work
A has worked B works C had worked Dwill work
英语人气：820 ℃时间：2019-08-20 06:08:37
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