The pianist didn't _____ until the last minute before the concer

The pianist didn't _____ until the last minute before the concert.
A、turn off
B、turn on
C、turn out
D、turn up
【正确答案】：D
【题目解析】：此题考查词组。Turn off关闭，turn on打开，turn out发生，turn up出现。根据题意，选项D是正确的。【句子大意】钢琴演奏者直到音乐会开始前的最后一分钟才出现。