This is the only article was written by him.A. whoB. whomC. whichD. that

网友回答

A. who
B. whom
C. which
(答案→)D. that
解析：考查定语从句：先行词是物，定语从句中缺少主语，一般用that或which引导定语从句，因为先行词被the only修饰定语从句只能用that引导，句意：这是他写的唯一一篇文章。选D。