Contrary to that people had expected, no general agreement was r

Contrary to that people had expected, no general agreement was reached at the conference.
【正确答案】：that改成what。
【题目解析】：根据句意可知，与人们之前所期待的一切相反，会议上没有达成统一意见。what people had expected意为”人们之前所期待的一切“。