Thompson had two ways, neither of seems to have worked well.
A. whom
B. that
C. which
D. them
网友回答
A. whom
B. that
(答案→)C. which
D. them
解析：考查定语从句。本题定语从句的先行词是two ways，定语从句中which指代two ways作为of 的宾语。Whom的先行词必须是人，that不能放在介词的后面，them不能引导起定语从句。句意;Thomson有两个方法，两个方法似乎都很有效。故C正确。