These are_______and one of them is a yellow deer;those are__
These are_______and one of them is a yellow deer;those are_______and one of them is a white horse.
a deers horses b deer horse c deers horse d deer horses
答案上说选B 可我觉得应该是选D deer的复数是它原型 horse 复数不是+s吗,咋么还要原型呢?