,the guest speaker was us,the guest speaker was ushered into the auditorium hall to give the lecture.A.being shown around the campus B.having been shown around the campus.C.having shown to the campus 英语
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【答案】 应该选B
首先speaker和show是被动关系,并且又有先后顺序,参观完以后进的礼堂,所以选B