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--------around Tian Men Square ,the tourists were taken to v

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--------around Tian Men Square ,the tourists were taken to visit the palace museum.
ABeing shown B Having shown
我知道意思,但请问A是什么形式为什么不能选?
--------around Tian Men Square ,the tourists were taken to v
A是指正在进行,被动.B是该动作发生在谓语动作之前.并表被动.
主句是过去时.和从句不服.主句明显和从句有先后关系.所一B是对的.