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 -蘆山地震是什么時(shí)候發(fā)生的?
-它發(fā)生于2013年4月20日的早上8:02.

解答 答案選C.這里先理清on,in 和at 的用法:on,主要用在星期幾和具體的某一天或節(jié)目前.in,用于表示一段時(shí)間,或用于年、月、日、世紀(jì)、四季或泛指一天的上午、下午、晚上等.還可用于表示"從現(xiàn)在起,多長(zhǎng)時(shí)間以后或多久以后".a(chǎn)t,多用于表示具體的鐘點(diǎn)時(shí)刻前,也可用于固定搭配中,表示的時(shí)間大多比較短暫.此題第一個(gè)空后面是8:02,即一個(gè)具體的鐘點(diǎn)時(shí)刻,所以此空應(yīng)該填at,排除A項(xiàng)和D項(xiàng).第二空后面是the morning of April 20,2013,即具體某一天的早上,所以此空應(yīng)該填on.故C 符合題意,答案選C.

點(diǎn)評(píng) 這題只要弄清 on,in 和at 這三個(gè)介詞的用法,答案便一目了然.

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