New lawyers often come across various casesthey really don't know how to deal with in the

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(答案→)A. which
B. when
C. whom
D. where
解析：考查定语从句。本定语从句的先行词是various cases,关系代词which指代先行词，在句中作为动词短语deal with的宾语。When,where在句中做状语，whom的先行词必须是人。句意：新的律师总是会遇见各种在开始的时候他们不知道任何处理的案件。根据句意说明A正确。