单选题 ______ sets man apart from the rest of the animal kingdom is his ability to speak.
  • A. Which
  • B. Whom
  • C. Who
  • D. What


【正确答案】 D
【答案解析】[分析] 关系代词what在主语从句中用作主语，相当于the thing which；that在主语从句中只起到引导作用，不用做成分。如：That we need more equipment is obvious．Which不引导主语从句；who合语法，但不合题意。