Question

3.   ―Do your parents have a big house?
―No, they__________ .

A. isn't           B. don't

C. doesn't          D, aren't

Answer 1

3.  B考查助动词。句中的主语是复数名词parents，其一般疑问句借助助动词do，且答语应与问句保持一-致，故选B。