问题补充：
A few years ago, 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
答案：
(答案→)A. who
B. which
C. they
D. that
解析：句意：几年前《我心永恒》在青年们中间是非常受欢迎的，人们经常在聚会时唱首歌。这里是非限制性定语从句，先行词是people，关系词在从句中作主语，that不能引导非限制性定语从句，故选A。
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