He has three sons ,and all of them are docHe has three sons ,and all of them are doctors.这个句子中为什么of后用的是them而不是they?
问题描述:
He has three sons ,and all of them are doc
He has three sons ,and all of them are doctors.这个句子中为什么of后用的是them而不是they?
答
介词后面不是加宾语吗?