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

分析 --打擾一下，藝術(shù)節(jié)是什么時(shí)候？
--是在星期一上午的8點(diǎn)半．

解答 答案：C．
at意思是"在"在具體的時(shí)間點(diǎn)前面要用介詞at；in意思是"在"在月份前面用in；on意思是"在"在具體的某一天的上午，下午用on．根據(jù)"It's           8：30a．m．          Monday morning"第一個(gè)空格后面是時(shí)間點(diǎn)，所以第一個(gè)空要用at，第二個(gè)空格后面是周一上午，所以要用on，綜上所述，故選C．

點(diǎn)評(píng) 首先要掌握這幾個(gè)介詞的意思以及用法，然后結(jié)合具體的題目，就可以確定正確答案．

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