i don't know what this is.do you know who the girl standing at the door,这两个句子是宾语从句吗?

i don't know what this is.do you know who the girl standing at the door,这两个句子是宾语从句吗?
i don't know what this is.do you know who the girl standing at the door,
这两个句子是宾语从句吗?

i don't know what this is.do you know who the girl standing at the door,这两个句子是宾语从句吗?
是的.第二句最后应加上一个is