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1.When Mary arrived at the party,most of the guests___A)already left B) have already leftC)had already left2.They___ to America last summerA)had traveled B)have traveledC)traveled3.My sister is used___to bed earlyA)to go B)to going C)going4.As he___home from work,he ran into is bossA)walked B)was walking C)had been walking5.She was upset because she___the examA) won't pass B) hasn't passedC) hadn't passed