The unemployment rate in this district (has fallen) from6%to 5%in the past two years为什么括号内不能是 had fallen

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Theunemploymentrateinthisdistrict(hasfallen)from6%to5%inthepasttwoyears为什么括号内不能是hadfallenTheunemploy

The unemployment rate in this district (has fallen) from6%to 5%in the past two years为什么括号内不能是 had fallen
The unemployment rate in this district (has fallen) from6%to 5%in the past two years
为什么括号内不能是 had fallen

The unemployment rate in this district (has fallen) from6%to 5%in the past two years为什么括号内不能是 had fallen
这是现在完成时 in the past two years 是过去两年里 是指两年前一直到现在 典型的现在完成时 如果用had 是过去完成时 表示过去的过去 没有这个时间概念 所以不用had结构
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全文没有过去时，因为had done 是过去完成时，表示发生在过去的过去。
而 in the last/past ...years/days 是现在完成时的标志。

in the past two years 跟现完

The year of the rat. rat rat? A rat in the jam. The graduation is faces the unemployment? the extension of unemployment benefit什么意思 The Year of Rat:- 翻易急!!!!!!!!!!详细点? 什么叫year of the Rat?快 A rat has nuts in the hut. THE FAT CAT ATE THE BIG RAT 是什么意思? the fat cat the big rat的中文意思 The cat is bigger ____ the rat.(then,than) what is the different between rat and mouse in English? The rat-catcher can't catch caught rats.的意思 The rat is black.(写出句子的表语） The rat-catcher can't catch caught rats. 什么叫year of the Rat?一定要快! unemployment是什么意思?