题目内容
5．-When will the graduation ceremony be held？-Oh，it will be held____9 a．m．next Friday．Don't be late．（ ）
| A． | on | B． | at | C． | in |
分析 --毕业典礼将在什么时候举行？
--将在下个星期五的上午九点举行，不要迟到了．
解答 答案：B．
根据设空处后面的时间"9 a．m．next Friday"可知句子中的时间状语是"下个星期五的上午九点"，是考查具体时刻前面的介词，用介词at． at+时间点； in+年、月、季节等；on+具体的某一天或某一天的上午/下午/晚上．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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