治疗肾结石中药配方:一道英语题。
来源:百度文库 编辑:神马品牌网 时间:2024/05/24 00:54:59
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!