【题目】We should produce fewer things from raw materials, the supply is growing smaller and smaller.
A. whose B. of which
C. where D. with which
在线课程【答案】B
【解析】考查非限制性定语从句。句意：我们应该更少的从原材料中生产出东西，因为原材料的供应正变得越来越少。which引导非限制性定语从句，构成the supply of which的结构，which指代上交的raw materials（原材料）。故选B。