——what made her so sad at that time?she kept crying all the

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——what made her so sad at that time?she kept crying all the time.___（）to the ball
我在不同的试卷上都碰见过这题,一个答案是选not be invited,另一个是not having been invited,到底选哪个,我个人倾向于后者,应为动名词作主语更合理些,但是在时态上我又感觉前者合适些,因为动作都是发生在过去,包括invite这一动作.

Here "not having been invited" means "the fact that she had not been invited",meaning the result from the past is affecting her right now.
In addition,you need a gerund to start a sentence here.
So choose "not having been invited".

——what made her so sad at that time?she kept crying all the 非谓语动词What made her so sad?She kept crying all the time._____ — What made her so sad?— _____ she failed in the examination the baby kept crying _______(at that time还是all the time) the baby kept crying （）what‘s wrong A at that time B the sam The movie was so＿＿(move)that it made all of us crying ---what made her sad? Was it what he said ___ made her so sad? She was so sad that she spent the whole day___in her own roo what made me sad was that i went to see her the day before y Mary is crying;you _____ her the sad news so soon The movie was so sad that it made us cry.