题目内容：

He must have been ill,____?Yes ,otherwise he wouldnt be absent from the party yesterday.
A.isn't he B.wasnt he C.can't he D.mustn't he

优质解答

B
解析：He must have been ill,_wasn't he___?Yes ,otherwise he wouldnt be absent from the party yesterday.
他一定是病了,不是吗?是的,否则他不会在昨天的party上缺席.
（因为是昨天,所以用过去时.）
百分百正确!