【解析】从句What one needs作主语,is为系动词,但persist...为动词短语,不能充当表语,因此应修改为非谓语动词,即不定式形式。 非谓语动词误用 No.1 非谓语动词作状语时,逻辑主语与主句主语不一致 【原句】To show my regret,my friendliving in Canada will buy a new...