示某一具体的时刻Zacharystartedplayingviolin____age4.todo解析:at;atnoon,midnight固定搭配例题ItwillopenforentriesatnoonTuesdayandwillclose_____noonThursday.on的用法1.表示具体某一天2.表示在周几及特定的早中晚。onMonday,onSundayafternoon,onacoldnight3.on+doing一...就...Onseeingthesnake,thegirlwasveryfrightened时间介词时间介词atonin的辨析解析:on;表示具体某一天_____seeingthesnake,thegirlwasveryfrightened.解析:on;on+doing一...就...Thisyear'seventwilltakeplace_____June19th,aweekearlierthanusual.例题解析:On;表示在特定的早中晚_____asunnymorning,wegottogetherchatting.例题in的用法1.表示一天中的早、下午、晚,inthemorning,intheevening.2.表示较长的时间段,如月份,季节,年份,世纪等.3.表示岁数inone's20th,30th,40th4.in+时间段表示...之后如in5days五天后时间介词时间介词atonin的辨析解析:in;in+时间段表示...之后JohnnyCarsonbeganhiscareerintelevision_____histwenties.解析:in;表示岁数.在20几岁时Weoftenthinkofthefutureandwonderwhattheworldwouldbelike______ahundredyears’time.例题