I hear that John is going back to London,A.don't B.isn't he C.isn't I D.doesn't 请问该选哪一个

B
这主要是想对“约翰打算回伦敦（John is going back to London）”进行反问，所以用isn't he。

【B】
John is going back to London，主要考察此句的反义疑问句。反义疑问句，如果句中含有think，看主语。主语是第一人称，对从句进行，如果是第三人称，对主句进行。
望采纳，谢~

.I hear that John is going back to London ,isn't he?

B
应该对从句进行反意疑问