I’ll never forget the day we worked togetherA. whenB. whichC. thatD. where

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(答案→)A. when
B. which
C. that
D. where
解析：考察定语从句。本题定语从句的先行词是the day后面定语从句的句中结构很完整，故使用关系副词when在句中做时间状语。句意：我永远都无法忘记我们一起工作的那些日子。故A正确。