He must have learn English for three years,___? A.hasn't he B.haven't he C.mustn't he D.didn't he

问题描述:

He must have learn English for three years,___? A.hasn't he B.haven't he C.mustn't he D.didn't he
为什么选B不选D
不还意思看错选项了是A

因为这是现在完成时(过去分词),表示过去已经完成的事情关键词是have