Have you ever dreamed of staging a concert, thousands of people are applauding and appreciating your music?
A. at which
B. when
C. for which
D. which
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(答案→)A. at which
B. when
C. for which
D. which
解析：A 考察定语从句。句子的先行词是concert，并在从句中做地点状语，代入从句后，需加介词at，故A正确。