先看一個練習：
James was born in London____May 7, 1952 ____4:45____the morning.
A. on/at/in
B. in/at/in
C. in/at/on
D. on/by/in
①in 一段時間（通常多于一天）。如：in January, in winter, in 1999;in還可以泛指在上午，下午，晚上，如：in the morning(afternoon, evening).
②on指在具體的某一天或某一天的上午，下午，晚上，如：on Monday, on Sunday afternoon, on July 1, 1999
③at時間最短，一般表示點時間，如at six o’clock, at three thirty。at 還可以用于一些習慣用法：at night, at noon, at this time of year.
所以根據以上分析，正确答案應該是A。
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