高考问答怪物猎人p3拔刀珠:一道英语题。
来源：百度文库 编辑：高考问答 时间：2024/05/04 13:00:59
It's useful to do sth还是It's useful doing sth.
It is useful to do sth.
It is no use doing sth.
应为It's useful to do sth
一般为It's+形容词(如：helpful thankful )to do sth
t's useful to do sth
恩,就是It is useful to do sth.
前者！