In the past few years, My Heart Will Go On was a popular song among young people, were often heard singing it at parties．
A. who
B. which
C. they
D. that
网友回答
(答案→)A. who
B. which
C. they
D. that
解析：考查定语从句。本题定语从句的先行词是young people, 定语从句中缺少主语，故使用who;句意：在过去几年里，《我心永恒》是一首很很受年轻人欢迎的歌曲，这些年轻人经常被听见在聚会中听这首歌。故A正确。