问题
选择题
——_________ should your robot need_________ batteries?
——Every two months.
A．How soon, to be changed
B．How long, to change
C．How much, change
D．How often, to change
答案
答案：D
考查特殊疑问句的回答。根据答语 Every two months可排除A 和B ,且句中的need是实义动词need to do sth.故选D。