Tom's first job was at a local restaurant in his early twenties， he worked for seven years.
A. where
B. when
C. which
D. that
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(答案→)A. where
B. when
C. which
D. that
解析：A 考查非限制性定语从句。句意：Tom的第一份工作是他二十出头时在一家当地饭店的工作，在那儿他工作了七年。根据句意，先行词是a local restaurant，在定语从句中作状语，故选A。