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18.-When did the earthquake in Lushan happen?
-It happened ______ 8:02 _______ the morning of April 20,2013.(  )
A.on; inB.at; inC.at; onD.on; on

分析 -芦山地震是什么时候发生的?
-它发生于2013年4月20日的早上8:02.

解答 答案选C.这里先理清on,in 和at 的用法:on,主要用在星期几和具体的某一天或节目前.in,用于表示一段时间,或用于年、月、日、世纪、四季或泛指一天的上午、下午、晚上等.还可用于表示"从现在起,多长时间以后或多久以后".at,多用于表示具体的钟点时刻前,也可用于固定搭配中,表示的时间大多比较短暂.此题第一个空后面是8:02,即一个具体的钟点时刻,所以此空应该填at,排除A项和D项.第二空后面是the morning of April 20,2013,即具体某一天的早上,所以此空应该填on.故C 符合题意,答案选C.

点评 这题只要弄清 on,in 和at 这三个介词的用法,答案便一目了然.

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