单选题 An investigation was carried out on the admission rate of the children in the south area, ______ were surprising.
【正确答案】 B
【答案解析】句意:一项关于南方地区儿童入学率的调查结果十分令人惊讶。逗号之后为非限制性定语从句,指“该调查的结果”,因此应当用which来引导,其中which指代investigation。A项中应当把which改为whose。故答案选B。