---He was nearly 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
B. that; when
(答案→)C. that; that
D. what; when
解析：That，it都指那件事第二句补充完整为 He was nearly drowned in 1983 when he was swimming with his friends.