Between the two parts of the concert is an interval, the audience can buy ice-cream.
A. when
B. where
C. that
D. which
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(答案→)A. when
B. where
C. that
D. which
解析：考查定语从句：句意：音乐会的两部分中间有幕间休息时间，在这段时间里观众可以去买冰激凌。when引导的定语从句修饰an interval（间歇），when在从句中作时间状语。所以选A。