The poor ____ happy.A.is not always B.hasn't always C.are no

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The poor ____ happy.A.is not always B.hasn't always C.are not always D.haven't always
求正确答案,并给出解题思路,如为什么选这个,其他几个错在哪里?

C the poor是特指穷人这个群体,所以后面跟复数,排除 A和B.C的意思是穷人不总是幸福的.D是现在完成时,这句话只要一般现在时就可以了,只是陈述一下而已.
再问： 1、那什么情况下，才要用现在完成时？ 2、是不是陈述一个事实用一般现在时就可以了？
再答： 1、现在完成时表示到说话时为止（或到现在为止）已经发生或完成了（不一定结束）的动作或状态。过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。有个“已经”的意思 2、个人觉得陈述一个事实不牵涉到其他的时态。不过毕业好多年，还是按你们英语老师上课讲的吧。

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