【题目】It was the middle of the night _______ the sound of the piano woke me up.
A.because
B.if
C.that
D.when
在线课程【答案】D
【解析】
考查定语从句。句意：我是在半夜被钢琴声吵醒的。分析句子结构可知“_______ the sound of the piano woke me up.”为之前名词短语“the middle of the night(午夜)”的定语从句。先行词在从句中作时间状语，应用关系副词when引导。故选D项。