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

问题补充：

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

A. when

B. where

C. that

D. which

答案：

(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。