Frank has some cats.there are (1)running in the room.You can see there is a cat in front of two cats,a cats behind two c
问题描述：
Frank has some cats.there are (1)running in the room.You can see there is a cat in front of two cats,a cats behind two cats,and a cat between two cats.
答
弗朗克有一些猫.有一些正在房间里跑.你可以看到有一只猫在两只猫的前面.一只猫在两只猫的后面,一只猫在两只猫的中间.
a cat ,
a cats behind two cats 单数不必加s