to do 不能作谓语的话下面那个句子,主语从句里面的谓语是什么?
Finding ways to assist this growing homeless population has become increasing difficult.to do 不能作谓语的话这个句子,主语从句Finding ways to assist this growing homeless population里面的谓语是什么?
如果他不算是主语从句的话，那他算什么？