his powers of persuasion were to no avail.这里为什么要加一个to 好像是多余的?
问题描述：
his powers of persuasion were to no avail.这里为什么要加一个to 好像是多余的?
答
你好.to no avail是个习惯用法,一般不能随便添加词或者省略单词.不过你可以使用 without avail,
to no avail == without avail--------意思一样.