Young people who have got jobs may realize university lessons can’t be the only preparation for all of the situations ______ appear in the working world.
A.where
B.when
C.that
D.what
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C解析考察定语从句。本句容易误选A，where引导定语从句时，在从句中作地点状语；但事实上，本句的从句中缺少一个主语，所以要用关系动词。