单选题 This maths problem is ______ that one.
  • A. so easy as
  • B. as difficult as
  • C. much difficult than
【正确答案】 B
【答案解析】[解析] 固定搭配题。as... as...“和……一样”，故B为正确答案。C项中正确表达应为：more difficult than。