1.Isthisthefactory______youvisitedtheotherday?

　　A.thatB.whereC.inwhichD.theone

　　变为陈述句就好理thisisthefactorythatyouvisitedtheotherday?定语从句,引导词that在从句中作visit的宾语.A.that

　　2.Isthisfactory______someforeignfriendsvisitedlastFriday?

　　A.thatB.whereC.whichD.theone

　　变为陈述句：thisfactoryistheone(that)someforeignfriendsvisitedlastFriday

　　句中无先行词,所以选theone作factory的同位语,后接定语从句.引导词that省略.D.theone

　　3.Isthisthefactory________heworkedtenyearsago?

　　A.thatB.whereC.whichD.theone

　　横线后的从句缺状语,work后接工作地点,所以定语从句用where引导.B.where