题目内容

18．--Excuse me，when is the Art Festival？
--It's           8：30a．m．          Monday morning．（　　）
A．at； inB．on； onC．at； on

分析 --打扰一下，艺术节是什么时候？
--是在星期一上午的8点半．

解答 答案：C．
at意思是"在"在具体的时间点前面要用介词at；in意思是"在"在月份前面用in；on意思是"在"在具体的某一天的上午，下午用on．根据"It's           8：30a．m．          Monday morning"第一个空格后面是时间点，所以第一个空要用at，第二个空格后面是周一上午，所以要用on，综上所述，故选C．

点评 首先要掌握这几个介词的意思以及用法，然后结合具体的题目，就可以确定正确答案．

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