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

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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
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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
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 recruitsamong the sons of small farmers,hunters in the backwoods,swamp trappers,Crackersand,in a very few cases,even poor whites,if they were above the average oftheir class.

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
首先,这个故事讲的是过去的事情,所以be肯定不能用现在时,而必须用过去时.其次,如果用与陈述语态相同的时态,表示其发生（或出现）的时间与陈述语态所发生的时间大致相同（从语法角度考虑,此处是可以用过去时was的）；如果用过去完成时态,表示其发生（或出现）的时间比陈述语态所发生的时间更早,也就是相当于汉语的“早就需要...”.

But rich planters were few in the young county of Clayton, and, in order to muster a full-strength troop, it had been necessary to raise more recruits among the sons of small farmers, hunters in the b...

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But rich planters were few in the young county of Clayton, and, in order to muster a full-strength troop, it had been necessary to raise more recruits among the sons of small farmers, hunters in the backwoods, swamp trappers, Crackers and, in a very few cases, even poor whites, if they were above the average of their class.但是在年轻的克莱顿县富有的农场主很少,为了召集一个强大的队伍, 有必要
在小农户、边远地区的猎人、沼泽猎人、精神病人的儿子中筹集更多新兵，并在极少数情况下,
甚至贫穷的白人,假如他们高于他们阶层的平均水平。

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