--- Are you familiar with the music ?--- Yes. There was a time this kind of music was qui

问题补充：

--- Are you familiar with the music ?

--- Yes. There was a time this kind of music was quite popular.

A. when

B. that

C. with which

D. about which

答案：

(答案→)A. when

B. that

C. with which

D. about which

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