If it really doesn't matter,why did you look so upset?
首先 你用了be动词,而be 动词后面的动词不可能是原型,可以改为why are you upset 为什么你伤心
如果要加上look,而看起来那么伤心,他/她已经伤心了,所以改用过去时did.
If it really doesn't matter,why did you look so upset?
首先 你用了be动词,而be 动词后面的动词不可能是原型,可以改为why are you upset 为什么你伤心
如果要加上look,而看起来那么伤心,他/她已经伤心了,所以改用过去时did.