People have the belief factories should produce fewer things from raw materials, the supply is growing smaller and smaller.
A. which; that
B. that; of which
C. that; whose
D. which; whose
网友回答
A. which; that
(答案→)B. that; of which
C. that; whose
D. which; whose
解析：
第一空that引导同位语从句，解释说明the belief的内容；第二空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）。
句意：人们相信工厂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。