It’s unpopular song．So people enjoy listening to it．
A. an / a few
B. a / few
C. an / few
D. a / a few
网友回答
A. an / a few
B. a / few
(答案→)C. an / few
D. a / a few
解析：句意：这是一首不太受欢迎的歌曲。所以没有几个人喜欢听。 unpopular song，泛指一首歌曲，且unpopular以元音开头，所以用an修饰；因为不受欢迎，所以应是没有几个人喜欢听，所以用few;而a few是一些，几个的意思。选C。