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题目内容
（华北水利水电大学英语）
Unfortunately,whenIdroppedin,ProfessorSmith________,soweonlyhadtimeforafewwords.
·hasjustleft
·hadjustleft
·justleft
·wasjustleaving
·hasjustleft
·hadjustleft
·justleft
·wasjustleaving
参考答案
