()to your hometown twice,iknow that it is really

问题描述:

()to your hometown twice,iknow that it is really
a beautiful place 为什么用Having been 不用 To have been

动词ing形式做主语表示主动,因为后面的主语是I,前后主语一致应该是ing形式.动词不定时做主语表被动和将来,所以不适合.