题目

It was the middle of the night _______ the sound of the piano woke me up.A.becauseB.ifC.thatD.when 答案：【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。把一根木头锯成两段要用4分钟，如果锯成5段要用______分钟．