Tom's first job was at a local restaurant in his early twenties he worked for seven years.

问题补充：

Toms first job was at a local restaurant in his early twenties，he worked for seven years.

A. where

B. when

C. which

D. that

答案：

(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。