It was during World War II, he was in his early twenties, he joined the British Army.
A. that; when
B. when; that
C. when; when
D. that; that
网友回答
A. that; when
(答案→)B. when; that
C. when; when
D. that; that
解析：本题考查定语从句及强调句。句中when引导定语从句，先行词为World War II，在从句中作时间状语，that引导强调句。句意：是在第二世界大战期间，当时他20多岁，他参加了英国军队。