单选题
______, the guest speaker was ushered into the auditorium hall to give the lecture.(北京大学2005年试题)
A、
Being shown around the campus
B、
Having shown to the campus
C、
After been shown around the campus
D、
Having been shown around the campus
【正确答案】
D
【答案解析】
解析：因为在was ushered into the auditorium hall之前就发生了be shown aroundthe campus这一动作，所以应用完成时的被动语态。因此D项为正确答案。
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