时态怎么选1.by the middle of the 1920s the farthest corners of the earth ___ explored.A have been B had been 为什么不是用A更好吗?还有影响.2.after world war 2,mass immigration _ Australia into a modern nation.has transformen

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时态怎么选1.by the middle of the 1920s the farthest corners of the earth _______ explored.A have been B had been 为什么不是用A更好吗?还有影响.2.after world war 2,mass immigration _____ Australia into a modern nation.has transformen
时态怎么选
1.by the middle of the 1920s the farthest corners of the earth _______ explored.
A have been B had been
为什么不是用A更好吗?还有影响.
2.after world war 2,mass immigration _____ Australia into a modern nation.
has transformen
为什么要完成时呢?一般过去时不可以吗?

时态怎么选1.by the middle of the 1920s the farthest corners of the earth _______ explored.A have been B had been 为什么不是用A更好吗?还有影响.2.after world war 2,mass immigration _____ Australia into a modern nation.has transformen
1、
地球最远的角落已经在 the middle of the 1920s之前被发现了,所以只能用过去完成时
2、
World War2以后,人们是不断的向Australia移民,持续到现在,所以用现在完成时
竭诚,望采纳!

到这个时间为止，就是在这个时间前发生的事，是过去的过去，所以用过去完成

第一题的技巧：看到BY，不用考虑，肯定选过去完成时态，原因忘了，但是这是必须得
第二题：表示过去发生的事情对现在的影响，尤其是移民肯定又影响，这是过去时态和完成时态的很大的一个区别

1.by the middle of the 1920s 到20世纪20年代中叶为止，地球的最远角落已被开发。
been explored发生在 middle of the 1920s 之前，相比现在来说是过去的过去，所以选B.
2.强调对现在的影响。

A是现完成时啊。B是过去完成时啊,而且题目中是过去的对现在有影响。
第二题现在完成时是动作到现在为止已经完成或刚刚完成。所以用现在完成时

时态怎么选1.by the middle of the 1920s the farthest corners of the earth _______ explored.A have been B had been 为什么不是用A更好吗?还有影响.2.after world war 2,mass immigration _____ Australia into a modern nation.has transformen by the time 的时态怎么用by the time 主句从句分别用什么时态给几个例句英语时态语态,选什么?japan's population was largest in 2006.it_to fall below 100 million by the middle of this century.Ais expe cted Bis expecting Chas expected Dwill be expected This is the only articles of these that _____written by him A.was B.were c.is D.are怎么选那时态呢？请注意时态啊 by the time后加什么时态 by the time 用于什么时态 By the end this month 什么时态? by the end是什么时态的标志如果句子中出现by the time,它的时态是怎么推的?如何推. The river rose by two feet after the heavy rain是什么时态如果是过去完成时态怎么rose前没有have那可以为一般现在时态吗 The river rise by two foot after the rain form then on 如题,还有That the vocabulary of the average person almost stops growing by the middle twenties.这句话最后by the middle twenties at the end of是什么时态标志?by the end of是什么时态标志? 英语MIDDLE是什么意思In the middle of the wall 这句英文怎么翻译成中文? by the time主从句时态请分情况说明 by/at the age of分别使用什么时态 by the time都有什么意思、用什么时态? 主句将来时by the time 从句用什么时态有by the time,用什么时态或什么句式?