【题目】It was the middle of the night____________ the sound of the piano woke me up.

A. becauseB. ifC. whenD. although

【答案】C

【解析】

考查时间状语从句。A. because因为；B. if如果；C. when当------时候；D. although尽管。句意：当我被钢琴声吵醒的的时候是半夜。此处是when引导的时间状语从句，故选C。

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