A 解释:无用怀疑她诚实....as to 1)表示涉及某点:as to常放于句中,表示“关于……方面”、“有关……之事”,但为了突出要提及的人或事之时,也可将as to置于句首,以示强调。但只涉及内容,而不涉及讲话人的态度。例如: ①His wife,an old teacher,has n0 complaint as to salary. ②As to your ability to overfulfil the target,I never had the slightest doubt. 2)用以重提旧事:as to引出的内容都是前文曾经提到过的或者谈话对方都有所了解的,表示“说到”之义。,例如: