-Are you familiar with the music?
-Yes. There was a time this kind of music was quite popular.
A. that
B. when
C. with which
D. about which
网友回答
A. that
(答案→)B. when
C. with which
D. about which
解析：句意：上文，你对音乐熟悉吗？下文，是的。有一段时间这种音乐很流行。这个句子中含有一个定语从句，且关系词在从句中作时间状语，故用关系副词when，选B。