it was at three o'clock that we finished the job为什么用that而不能用when

It will start at three o'clock. it was at three o'clock that we finished the job为什么用that而不能用when It will begin at three o'clock.怎么改为问句 It was three o'clock ten minutes ago.What will it be an hour's time? it,s only three o, It was three o'clock that we reached the village.改错! o'clock,past,half,at,three,is,it(.)连词成句 It bagins at three o`clock in the afternoon.(改一般疑问句）快点啊,越快越好! 英语翻译I still remember my first day in the U.S.very clearly.My friend was waiting for me when my plan landed at Kennedy Airport at three o’clock in the afternoon.The weather was very cold and it was snowing,but I was too excited to mind.From 请帮助翻译“He was dismayed .It was not so much having toach the children at three levels , it was 8 o 请问it was worth saving two boys at the cost of three students' lives.这是什么句型,里面的it指什么原句是：they ask if it was worth saving two boys at the cost of three university students'lives. you,at,o'clock,where,three,were(?) longer,live,than,animal,other,whales,any(.)I,playing,with,was,basketball,Tom,afternoon,the,this,gym,at(.)his,met,at,feiend,the Metro station,peter,morning,on,Sunday(.)and,Ann,chess,playing,is,good,likes,at,it,she(.) It was three years before he came It was three o'clock.we could not get lunch.we had a cup of tea.用用and...so连接 four o'cat 的意思是什么?原话：It might reduce four o'cat to three o'cat,but the game went on just the same,and where was 根据情景,补全对话A:Did you hear the car accident?B:No,I know n___ about it.When and where did it happen?A:A___ about three o'clock at the corner of the road near our school.B:H___ was the accident and was anybody h____?A:Two cars h____ and on 我英语不好~帮我查查错!16.It was three o’clock __A__ we reached the village.A.that B.which C.when D.it17.It was at ten __A__ we reached the village.A.that B.which C.when D.it18.–What’s on your desk?--Oh,__B__ is the very dictionary tha