在英语语法中,一个句子只能有一个主语和一个谓语动词.
这句话中,主语是we 谓动是were taken to.前半句还原的话,就是：we have been shown…… 这句话是一个独立主格结构,因此,它并不能拥有谓语动词,于是就用-ing形式使它成为非谓语动词,做伴随.
在过去完成时态中,have是助动词,不能有被动态,故用having表示非谓,并加been表示被动.
were 的问题,整句话是表示过去时态.水立方在鸟巢之前,因而就是过去的过去,用过去完成时.
关于英语的问题Having been shown around the Water Cube,we were then
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