The expert’s theory, my opinions were based, proved right in the end.
A. on which
B. whom
C. for which
D. that
网友回答
(答案→)A. on which
B. whom
C. for which
D. that
解析：考查定语从句。本题定语从句的先行词是theory,在定语从句中用which指代先行词作为介词on的宾语。这里的介词on是有更多搭配be based on…转换而来。句意：这位专家的理论最终证明是正确的，我的观点是以他的理论为基础的。故A正确。