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——————on May Day,the Expo has attracted tens of thousands of

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——————on May Day,the Expo has attracted tens of thousands of visitors around the world every day
A having opened Bopened C opening D being opened
我选的是D,但答案是B,opened只是个形容词,我觉得成分残缺啊,请详细讲一讲,
——————on May Day,the Expo has attracted tens of thousands of
open,clean这类词动词和形容词性写法一样,容易弄混.opened在这里是过去分词短语作状语 被开放 之意