题目内容
4．---When did the accident happen？---It happened ____ six o'clock ___ the afternoon of last Monday．（ ）
| A． | at，on | B． | in，on | C． | for，in |
分析 事故什么时候发生的？--发生于上个星期一下午6点．
解答 答案：A 根据six o'clock，可知这是时间点，用at．根据the afternoon of last Monday，可知这是具体到了某一天的下午，故用on．故选A．
点评 本题考查时间介词的辨析．熟练掌握时间介词的用法是做题的前提．
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