There's a box of books on the floor.Please put ( ) on the teacher's desk.

问题描述:

There's a box of books on the floor.Please put ( ) on the teacher's desk.
再给我一下理由,谢谢!

they
用they指代前面那一句提到的那一箱子书.
地板上有一箱书.把它们放到教桌上为什么