____in history when remarkable progress in relatively short

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____in history when remarkable progress in relatively short periods of time.
A.There has time B.it is time C.There has been time 我觉得选B啊.求解释 2.“were all the people in the bus injured?""NO,_____only five passengers who got hurt."我觉得应该填there were.为什么答案是it was? 3.___was no doubt that his health was returning.我觉得应该填it..如果把it was...that 去掉.句子也通啊可是答案偏偏是there?. 4.where there is shale____likely to be oil.我填it is ..there is .我无语的不理解啊

1.relatively short periods of time：相当短的一段时间,但是再短它也是一段时间,所以前半句也要选能表示一段时间的——A.有时间,讲不通,淘汰B.It is time sb did /It is time for doing,到了该做某事的点了,注意是“点”,指某一刻,不能接一段时间C.现在完成时,可以表示做完了的状态,也可以表示某一动作延续至今,可以接一段时间.整句话意思是：历史上有的时候重大的进步是在相对较短的时间段里完成的.（这句话貌似缺些东西,应该是There has been time in history when remarkable progress was made in relatively short periods of time.）这和句子I have been to Beijing several times.是一样的,虽然不是说到了北京就一直泡着不走,但强调的是从现在来看一种结果.看见句子中有表示次数和一段时间的词,像several times,periods of 就要选完成时,因为一瞬间完成的动作谈不上次数,也成不了“段”
2.there were应该出现在一段话的最前面,前面什么铺垫也没有的时候,比如讲故事的开头“从前有座山”——There are mountains,但是这句话已经有了上文,对描述的人进行了限定“in the bus ”,就不能再用there be 句型.It be表强调和问句呼应,因为是过去时,所以it was；
3.it was...that 是强调句,但是凡是强调句要强调肯定的东西,比如It was he who did the work.当然也可以是It wasn't he who did the work.但是请看,即使不是他做的,肯定也有人做.这和no doubt,no body,nothing这类表示神马也没有的还是不一样的,神马也没有还强调个啥,所以只能用there be+no doubt,no body,nothing
4.这句和强调更是啥关系也木有了,强调句it is 要放在句子最前面.所以it只能代替前面出现过的名词,那么这句话就变成了“哪儿有鲸鱼,鲸鱼是油”鲸鱼能产油没错,但怎么能说看见鲸鱼就是看见油呢,中文这么说没错,但变成英文就存在逻辑问题,除非你偷猎鲸鱼都红了眼了,只见海面上一坨坨油朝你游来.额,所以只能用there is,“鲸鱼在此,故油在此”

____ such great progress in such a short time. what(\)great progress you have zchieved in such(a)short time SHORT HISTORY OF ETHICS怎么样 When the teacher came in,he wae sitting at the desk,____in t Don't_____ _____ ____in a dicionary in a hurry when you meet I used ____in this river when I lived in the village 英语翻译This relatively slow progress has less to do with aptitu progress in ＆make progress with的区别? make progress in 与 make progress with make progress on/in WORK IN PROGRESS怎么样 Order in progress ）