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Mrgrandfatherwasbornacoldwintermorning.January,1948.选什么答案,为什么

题目详情
Mr grandfather was born ____ a cold winter morning._______ January,1948. 选什么答案,为什么
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答案和解析
有词修饰的morning,afternoon,evening,night等词前面用on介词
on a sunny morning
没有词则用in
eg.in the morning答案是on in