you can't imagine ____I want to go back to my hometown.It's quite a few years since I left there.A.how much B.how longC.how oftenD.how soon——He's already back to USA?——_____,He is on a visit to Shanghai.A.isn't he;NoB.hasn't he;No

you can't imagine ____I want to go back to my hometown.It's quite a few years since I left there.A.how much B.how longC.how oftenD.how soon——He's already back to USA?——_____,He is on a visit to Shanghai.A.isn't he;NoB.hasn't he;No
you can't imagine ____I want to go back to my hometown.It's quite a few years since I left there.
A.how much
B.how long
C.how often
D.how soon
——He's already back to USA?
——_____,He is on a visit to Shanghai.
A.isn't he;No
B.hasn't he;No

you can't imagine ____I want to go back to my hometown.It's quite a few years since I left there.A.how much B.how longC.how oftenD.how soon——He's already back to USA?——_____,He is on a visit to Shanghai.A.isn't he;NoB.hasn't he;No
第一个选A how much 表示程度、多么
第二个选A isn't he; No,这个上面两位选错了
He's是 He is,全句是 He is already back to USA,isn't he?
假如说He's 是He has,那么你看：He has already back to USA,hasn't he?对吗?显然不对.
只能说He has already gone/been back to USA,hasn't he?

Ahow much 你无法想象我多想回到故乡。自我离开那里已经很多年了
how much形容的是“我”想回到故乡的程度。
BNo he hasn't 他已经回到美国了吗？不，还没有。他现在在上海。
问句中he's是he has的缩写，所以回答也要has not，时态一致

A how much 多么 你不知道我有多想回家 我离开那已经很多年了
B he's 是 he has 的缩写 是完成时 所以 选B