He _____ a company in Russia for three years,and now he is t

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He _____ a company in Russia for three years,and now he is teaching in Shanghai.
A.runs B.had run C.ran D.has run

C,因为有个now在题目中,就是表示今昔对比,过去就要用过去式.
再问： “He _____ a company in Russia for three years”表现在已完成，为什么不用has run
再答：这个要看语境，后面紧跟and now，说明以前的事情对现在没有什么太大关系了，仅仅表示过去干了什么。

He _____ a company in Russia for three years,and now he is t he_____a company abroad for three years,and now he is teachi He is a s______ and he has been in the army for three years He is a s___ and he has been in the army for three years. He works in a company now,but he＿in a factory for 20 years. John is only three years old.He is in a k____ now. John is only three years old.He is in a k____ now Li Ping has worked in the company for many years.He is a m__ He's been in Londen for many years and now he__the weahter t He once worked in a hotel for two years.So he is a _____ man He has worked in the company for 15 years.H ( ) ,he,doesn~t My father (work) in a factory for five years.But now he is a