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There are about 15,000 visitors who visit the Summer Palace every day.A.on an averageB.in the averag

编辑:chaxungu时间:2026-04-24 12:50:51分类:高中英语题库

There are about 15,000 visitors who visit the Summer Palace ________every day.
A.on an averageB.in the averageC.at averageD.at the average在线课程A