Or when he was shown over the great Nanjing bridge, built where the ferries used to carry trains across the ChangjiangRiver.
请问built在这里做什么成分?
where...和built又是什么关系呢?
built为过去分词,where引导地点状语从句修饰built,构成过去分词短语。过去分词短语作定语修饰the great Nanjing bridge。这个过去分词短语相当于一个定语从句:which was built where the ferries used to carry trains across the Changjiang River.
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