He's already back from the trip,___?___ And he is now playing with his little son happily at ho

He's already back from the trip,___?___ And he is now playing with his little son happily at home.
A.hasn't he;Yes B.isn't he;Yes

弄不清是has还是is 麻烦解释一下谢谢

Millie can listen to the engineer's report again,for I ___ (record) it.

选B,是 is, 如果是has的话，那back要用完成时态backed,做动词讲。
但句子里是用的原形，那is back中的back是形容词， 回来的

recorded it 用过去式，因为前句是说millie可以重新听报告了，说明这个报告已经录制完成，所以后面用过去式。

b