The chair looked rather hard,but in fact it is very comfortable to sit on.

问题描述:

The chair looked rather hard,but in fact it is very comfortable to sit on.
各路英语才子们,小妹不知道句子中为什们会有个on,麻烦各位想想,给个回答,

因为sit 是不及物动词,必须有一个介词on在后,才能连接宾语chair