Granny goes to bed________nine every day．A.inB.onC.atD.for
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C解析分析：句意是“在9点钟”，表示在某个钟点数，要用介词at．(延伸)1)表示时间也可用after，before，until，by．如：We won't have classes after 4：00 P．m．/He nevergets up before five o'clock in the morning．/I won't e home until seven o'clock today．/By eighto'clock yesterday evening，I had finished all my homework．2)at表示时间的另外短语：atnight/at noon/at the moment/at that time/at the age of eight．