题目内容
8．-When did the terrible earthquake in Wenchuan happen？-It happened ______2：28 ______the afternoon of May 12，2008．（ ）
| A． | on，in | B． | at，on | C． | at，in | D． | on，on |
分析 汶川发生严重地震是在什么时候？--发生在2008年5月12下午两点28分．
解答 答案：B 在表示时间时，on表示在具体某一天；at表示在具体时刻；in表示在一个时间范围．根据下文the afternoon of May 12，2008，2008年5月12日下午，可知指的是具体某一天，用on the afternoon of May 12，2008，而2：28是具体的时刻，故用at 2：28，故选B．
点评 英语介词的一个特点是一词多义，并且介词间语义交叉现象很多，习惯用法也很多，有时很难从词义上区分开来．故学习中要注意不断总结，熟记一些介词和动词的固定搭配用法及习惯用法，是完成此类问题的捷径．
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