单选题 This is the best book ______ I' ve ever bought.
  • A) with which
  • B) that
  • C) which
  • D) when


【正确答案】 B
【答案解析】[解析] 先行词book前有形容词good的最高级“the best”修饰，关系代词只能用“that”。当先行词是“much”或“all”时，也只能用“that”。例如：Happiness is all that matters．(幸福是最重要的。)