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it was once common to 是固定搭配吗which led to their being known为什

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it was once common to 是固定搭配吗which led to their being known为什么用their不用they(全句见下)
it was once common to think of craft in terms of function, which led to their being known as the applied arts
it was once common to 是固定搭配吗which led to their being known为什
1.it was once common to并不是固定搭配,只是it is adj.to do sth.是固定句型.这个句子的意思是:曾经普遍存在.
2.which led to their being known.
their being known是被动形式的独立主格结构,充当宾语.如果用they的话那一个从句岂不是有2个主语了(还有一个是which做先行词的关系代词),再说to后面也不会接主格人称代词啊.
上面的语法看起来比较复杂,我是专门研究语法过的.其实没必要细究,你直记住 形容词性物主代词+现在分词+动词被动式(如果有的话)