这句话里的they为什么不能是them?which led to their being known as the ap

it was once common to 是固定搭配吗which led to their being known为什 】【急】As is known to us和which is known to us的区别,分别用在什么句子里 The people serve their "guest" as they prefer to call them a 为什么是them,which,them的顺序 英语语法的时态问题?There being no bus,we had to walk home.这句话里为什么后面是h 英语翻译Neither of them slept as well as they once had.这句话怎么翻译?是 they have fun (being) with their family 括号中为什么填being而不是to be they were interested() you told them,为什么不能填in which,which也可以 them,their,they的区别 them they their 的用法 they,them their 的用法 Your love can help them open their eyes to the world这句话啥意思 急