His father possesses a factory, which does most of the pollution to this river.
A. paper-make
B. paper-making
C. papers-made
D. paper-made
网友回答
A. paper-make
(答案→)B. paper-making
C. papers-made
D. paper-made
解析：考查构词法，名词+现在分词构成形容词。句意：他的父亲拥有一家造纸厂是这条河流的最大污染源。