Mrs. Black doesn’t believe her son is able to design a digital camera, ________?
A. is he
B. isn’t he
C. doesn’t she
D. does she
出自:国家开放大学英语语法

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块