用isn't it或doesn't it 填空:It always rains in summer in Beijing,( )?

问题描述:

用isn't it或doesn't it 填空:It always rains in summer in Beijing,( )?
请告诉我你为什么这么填?

doesn't it.
因为这个句子是主谓结构的:It是主语,rains是谓语,always,in summer,in Beijing都是状语.
主谓结构的句子,其反意疑问句的短句就应该用助动词do或does来填.
又因为it rains是三单形式,所以应该用doesn't it