Where do they live?He knows(合并成一句)

where do they live? where do they live?意思是什么? Where do they live?He knows(合并成一句) where do your parents_____?they ___ beijing?请给详细的解析,a.live in;live in b.live ;live c.live ;live in d.live in;live where do you live? where do i live? where do pandas live? where do you live?还是 where do you live in where about do you live where do the r____ live? where do they work? Where do they where do panda live?还是where does panda live?为什么? where you live跟where do you live的区别 where do you live为什么用do they live in shanghai对shanghai画线提问不对的说，where do they 中间还一个空空，然后捏，where do 也不对···· Where did they live o>_ where do they live?和where they live?哪个对,有什么区别应该是前边的句子对吧,do在句子里的有什么用?做助动词?如果是助动词,为什么要加这个助动词,不加不可以吗?