This I did at nine o'clock,after which I sat reading the pap

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This I did at nine o'clock,after which I sat reading the paper.

比较口语化的表达,为了强调this将其放于句首 ,原来形式应该是i did this at nine o'clock, after which是个非限定定语从句引导词,which代前面的”nine o'clock(注意此时没有代at）“,将这一时刻表达视为名词,加上 after”在那（九点）以后“
全句翻译：九点时我在做这个,之后我坐着看报纸/看那篇论文.
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This I did at nine o'clock,after which I sat reading the pap I did it at nine o’clock,and _________ I sat reading the pap I usually go_bed at nine o'clock in the evening. I begin work at nine o'clock和I begin to work at nine o'clock I did my homework(at nine o'clock)teasterday.对划线部分提问 I had finshed reading the novel by nine o' clock last night. I had finished reading the novel by nine o'clock last night I s____ at nine o'clock in the morning and s__ at one o'cloc I started at nine o'clock in the morning and s__at one o'clo I started at nine o'clock in the morning and a__at one o'clo i go to bed at nine o'clock every evening对 nine o'clock 提问 I go to bed at nine o'clock in the evening.这句话里,at