It was at 9 o'clock that he came back和It was 9 o'clock which he came back为什么分别that和which

It was at 9 o'clock that he came back和It was 9 o'clock which he came back为什么分别that和which I was at nine o’clock ______ I heard some terrible noises upstairs.It was seven o’clock _______ I was standing under the Big Ben It was at two o'clock p.m.when he came back.哪里错了? it's at ten o'clock. It will start at three o'clock. it was at 8 o' clock yesterday evening _____ the electricity was cut off.a,when b,untilc,thatd,which 两个英语句子的区别It was 3 o'clock when we reached the villageIt was at 3 o'clock that we reached the village为什么有at要用that 没有at用when make it 2 o'clock还是make it at 2 o'clock? Was it 8o'clock -----you heard someone------at the doorA.when knockingB.when knockC.that knockingD.that knock was it 8 o'clock _____you heard someone _____ at the door?a.liked b.wished c.meant d.expected it was at three o'clock that we finished the job为什么用that而不能用when It was at nine o’clock ______ I got up.A.that B.which C.how D.when He was at Mr.Deng's at 9 o'clock last Sunday对 at Mr.Deng's 提问 He was here at ten o’clock.的意思He was here at ten o’clock.是什么意思 i got home after it was 9 o'clock.（意思不变） i ____ _____ home ____it was 9 o'clock. 求详解! It was ten o'clock then.(用ten o'clock进行提问）What time --------- it's 6 o'clock 和at 6 o'clock有什么区别? we ( ) there at 9:00 o`clock