Between the two parts of the concert is an interval, the audience can buy ice-cream. A. w

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(答案→)A. when
B. where
C. that
D. which
解析：考查非限制性定语从句：定语从句所修饰的先行词是an interval，定语从句缺少during which这样时间状语，而关系副词when = 介词（during）+ 关系代词（which）= 介词（during）+ 先行词（an interval）。句意：音乐会两部分之间有个间歇，观众可以买冰淇淋，选A。