they looking very happy 中look有几个选项,1、LOOK 2、LOOKing 3、LOOKS 请问是哪个,急

问题描述:

they looking very happy 中look有几个选项,1、LOOK 2、LOOKing 3、LOOKS 请问是哪个,急
The children are playing in the bedroom ,They look very happy.

LOOK.标准答案.