请问:"The authorization letter was ready and has sent it to your office before.

问题描述:

请问:"The authorization letter was ready and has sent it to your office before.
我想表达的是:委托函已经准备好并且寄过去给你了.

用了and,后面没有主语表示和and前一句话公用一个主语,所以and后面主语是letter,那么就不要用sent了,可以写成and has already been sent to your office.before用在过去完成时.