Theymusthavelearnt5000Englishwordsbytheendoflastterm,

问题详情：

 They must have learnt 5000 English words by the end of last term, ________?

A. haven’t they        B. didn’t they        C. hadn’t they                    D. mustn’t they

【回答】

C

知识点：疑问句 反义疑问句

题型：选择题