A dog is on the chair A.sit B.sitting C.siting D.to sit回答者请说出原因,
问题描述：
A dog is on the chair A.sit B.sitting C.siting D.to sit
回答者请说出原因,
答
B sitting
答
选b ,c拼写错误,sit是主动得,所以要用ing形式,seat是被动的,要用ed形式