He is the man _________ you can turn when you are in trouble.
A.that
B.which
C.to whom
D.to him
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C解析试题分析：考查定语从句：先行词是the man，定语从句中turn后面少to和宾语，用to whom引导定语从句，句意：他是你有困难可以求助的人。选C。考点：考查定语从句：点评：考查定语从句一要看先行词，而要看从句的成分，如果缺少主宾表，要用that或which如果缺少状语，要用关系副词where，when或why。定语从句中缺少介词，要用介词+whom/which。