Mrs Black doesn't believe her son is able to design camera．__________ ?

A.is he

B.isn't he

C.doesn't she

D.does she

答案及解析： D

解析：

该题考查反意疑问句的用法.因为主句是否定句，其主语是Mrs Black，所以它的反意疑问句是does she.在含有宾语从句的句子中，要根据其主句的主语确定反意疑问句.这句意思是“布莱克夫人不相信她的孩子能够设计数码相机，对不对?”