He must be still there,____ A.mustn't he,B.isn't he C.must he.D.is he

问题描述:

He must be still there,____ A.mustn't he,B.isn't he C.must he.D.is he
He must be still there,____
A.mustn't he,B.isn't he C.must he.D.is he

must在表"推测"时,根据其推测的情况来确定反意疑问句.
所以选B