—He was early drowned in a pool.—Oh, when was exactly?
— It was in 1983 he was swimming with his friends.
A. this; that
B. that; when
C. that; that
D. what; when
网友回答
A. this; that
(答案→)B. that; when
C. that; that
D. what; when
解析：考查代词。第一空用that指前面所提到的内容；第二空用when引导状语从句，表示“当时他在和朋友游泳”。