问题补充：
---Emma has to stay at home to look after her little sister,?
---Yes, because her mother has gone to the supermarket.
A. does she
B. is she
C. doesn’t she
D. hasn’t she
答案：
A. does she
B. is she
(答案→)C. doesn’t she
D. hasn’t she
解析：此题考查反意疑问句的基本结构。反义疑问句由两部分组成，前一部分是一个陈述句，后一部分是一个省略的疑问句。如果陈述句是肯定的，反义疑问句用否定；如果陈述句是否定的，反义疑问句用肯定的。反义疑问句通常由两个词组成，第一个词是be、情态动词或助动词，若是否定式，not通常要用简略形式；第二个词是人称代词主格(与陈述句的主语相同)
