The first thing ( ) we should do isto clean the room.
问题描述:
The first thing ( ) we should do isto clean the room.
答
应该用that.
可能主要就是有两个比较模糊的答案,一个是that,一个是what.
因为前面的句子中有first这个词语,语法规则中规定前面有first的话,后面就应该用that.
所以用that.