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.
The first thing ( ) we should do isto clean the room.
The first thing ( ) we should do isto clean the room.
英语人气：617 ℃时间：2019-11-02 18:44:06
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