1.Someone ______ the classroom .Look!How clean it is A.has swept B.will sweep C is sweeping D had swept但我不明白为什么不能选D啊,那个人已经清洁过了,不是过去吗?

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1.Someone______theclassroom.Look!HowcleanitisA.hassweptB.willsweepCissweepingDhadswept但我不明白为什么不能选D啊,

1.Someone ______ the classroom .Look!How clean it is A.has swept B.will sweep C is sweeping D had swept但我不明白为什么不能选D啊,那个人已经清洁过了,不是过去吗?
1.Someone ______ the classroom .Look!How clean it is
A.has swept B.will sweep C is sweeping D had swept
但我不明白为什么不能选D啊,那个人已经清洁过了,不是过去吗?

1.Someone ______ the classroom .Look!How clean it is A.has swept B.will sweep C is sweeping D had swept但我不明白为什么不能选D啊,那个人已经清洁过了,不是过去吗?
一楼说的不够详细,我再画龙点睛下哈.小朋友,听好了.
这道题,如果光看前半句,就是Someone ______ the classroom .选A和选D都可以.语法都对.但是为什么选A呢,因为你看后半句,Look!How clean it is !
你要看出题者的意图到底是什么,因为中国的教育就是这样,上学时候做题的目的就是为了要选出来出题者认为对的答案从而得高分.
言归正传,根据这后半句话,可以看出来,这一整句是某个人看到教室被别人打扫干净了的时候,当时感叹说出来的一句话.相对于这个人说这句话的时候,别人已经打扫完了,就是说是在他说话的过去打扫的,所以相对于他说这句话的时候,应该用的是过去式.选A.
如果这道题换成when xiao ming came into the classroom,someone _____ the classroom.这个时候就要选D了,因为说或写这句话的人处于一个比小明进教室晚,比别人打扫教室更晚的一个时刻,所以,打扫的事情相对于这个人来说就是过去（小明进教室）的过去.
所以最重要的,你要看到底参考是哪个时刻.不管是过去,还是过去的过去,都要看参照物是谁,好比物理中的相对运动一样,参照物不同,时态就不同.
小朋友,祝你英语学好.

后面是现在时啊，前面怎么可能用过去完成时呢，要前后一致啊，用现在完成时表示过去完成的事情对现在的影响，表示到现在为止还是很干净

是这样的：
过去完成时表示过去的过去要有两个时间点的比较
现在完成时表示过去发生的事（扫地）对现在的影响（干净）
因此选A

完成时表示的是过去发生的分事对现在的影响所以选a d应该是过去的过去这个没法画否则可以那一个数轴给你话一下。

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