my father knows a lot about American culture ,for he ___ there for 2 years ,and then he returned home.A.stays B .stayed C.would stayD.have stayed

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• my father knows a lot about American culture ,for he ___ there for 2 years ,and then he returned home.A.stays B .stayed C.would stayD.have stayed
• my father knows a lot about American culture ,for he ___ there for 2 years ,and then he returned home.
• 设函数y=f(x)是定义域为R的函数,且f(x+2)[1-f(x)]=1+f(x),又f(2)=2+根号2,则f(2008)=
• 1.-Henry doesn't seen to be what he was.-No.( )so much in the war has made him more thoughful.A.Seen B.His seeing C.Having seen D.To have seen2.When last( )valuable,those books enjoyed great success.A.finding B.found C.being found D.to be found3.Do something!Don't just stand there ( )nothing!A.doing B.to do C.having done D.do 4.( )at the office,Mr.Green found the papers prepared for his boss were left at home.A.To arrive B.On arriving C.As arriving D.