With an appropriate relative pronoun:
(1)The treatment____ is being tried by doctors at these hospitals, has proved to be effective for patients.
(2)Mrs. Taylor,____ came on holiday with us, is now in Shanghai.
【正确答案】：which;who
【题目解析】：【考点点击】本题考查定语从句的关系代词。【要点透析】第一句是由 which引导的非限制性定语从句,指代 The treatment;在非限制性定语从句中,先行项指人时,关系代词用who而不能用 which,故第二个空填who
