it have been necessary 和 it is necessary 的区别?请问下句中it had been necessary用现在时为何不行?But rich planterswere few in the young county of Clayton,and,inorder to muster a full-strength troop,it had been necessary to raise more

gmat 逻辑题The price of maple syrup has jumped from 22 dollars three years ago to 40 dollars a gallon today.It can be concluded that maple-syrup harvesters have been artificially inflating prices and that governmental price regulations are necessa It should have been left In an international context,China presents an interesting case study.China's unique macro economic and political system has undergone a series of reforms which have thoroughly affected changes in the telecommunications sector,and have made it necessa It Must Have Been Love (Cologne) 歌词 I have been used to it. It Must Have Been Love 歌词 We have been used to it sadly What it could have been like是什么意思 1 You _____ (don’t have to／mustn’t)park on the corner．It’s dangerous.2 You _____ (mustn’t／1 You _____ (don’t have to／mustn’t)park on the corner．It’s dangerous.2 You _____ (mustn’t／needn’t)wait for me．It isn’t necessa it's a nice car._____ have been in it It would't have been better if it'd been a little bit cooler. 英语翻译 people have been visiting it for many years. I have been your room I like it very It could have been 谱子跪求这首曲子的谱 这个句子“It Must Have Been Love”说的是什么意思? It must have been so though for you,huh? it's okey to grieve for what could have been? Would you have called her up had it been possible?