单选题 ______ is especially surprising about the survey results is that an extremely high percentage of those asked to participate actually responded.
  • (A) That
  • (B) Which
  • (C) What
  • (D) It


【正确答案】 C
【答案解析】[语法] 包括先行词的关系代词what
[错误答案] results是主语，因此is是动词。(D)如果接it，就会出现两个动词is，所以是错误答案。