It is impolite____(laugh)at the peoplein trouble怎么填

问题描述:

It is impolite____(laugh)at the peoplein trouble怎么填

to laugh/laughing 第一个是it is v. to do sth.第二个是laughing 作主语,句子在impolite后面断,好像表示不同的状态,我认为这两个都行,但第二个不标准,若第二个应是laughing at the people in trouble is impolite,就这么说还应该填第一个to laugh