your sister a student?---No she .A. Is; isB. Is; isn’tC. Are; isD. Are; isn’t

问题补充：

--- your sister a student?

---No, she .

A. Is; is

B. Is; isn’t

C. Are; is

D. Are; isn’t

答案：

A. Is; is

(答案→)B. Is; isn’t

C. Are; is

D. Are; isn’t

解析：根据语境可知这个是一般疑问句，询问你妹妹是个学生吗？其回答有两种肯定性回答或否定性回答。前者用yes，she is。后者用no，she isn’t