单选题 The material ______ the apparatus is made is a good nonconductor of heat.
  • A. with which
  • B. of which
  • C. from what
  • D. with what
【正确答案】 B
【答案解析】因为取决于从句中的made of，相当于the apparatus is made of the material...。be made of sth. “由……做成的”。