1.The glass doors have taken the place ofthe wooden ones at the entrance,____ in the natural light during the day.为何用Letting,不用to let 或having let2.we have made ___ a rule to pracise oral English whenever and wherever____ possible.A.it ;it

1.The glass doors have taken the place ofthe wooden ones at the entrance,____ in the natural light during the day.为何用Letting,不用to let 或having let2.we have made ___ a rule to pracise oral English whenever and wherever____ possible.A.it ;it
1.The glass doors have taken the place ofthe wooden ones at the entrance,____ in the natural light during the day.
为何用Letting,不用to let 或having let
2.we have made ___ a rule to pracise oral English whenever and wherever____ possible.
A.it ;its B.it;it C .that;it D .it;/
3.Without proper lessons ,you could _____a lot of bad habits when playing the piano
为什么会选keep up.
4.The day we have been looking forward to ___ .
为何不用come而用has come难道不该是have been因为come非延续,不能与 have连用.
5.Most of the artist___to the party were form East.
A.invited B.to invit C.being invited D.had been invited
6.____ be sent to work here .
A.who do you suggest should B.who do you suggest that should .
C.Do you suggest who should D.Do you suggest whom should

1.The glass doors have taken the place ofthe wooden ones at the entrance,____ in the natural light during the day.为何用Letting,不用to let 或having let2.we have made ___ a rule to pracise oral English whenever and wherever____ possible.A.it ;it
1,如果分句之间没有标点符号,可以用 to let ,把木门换成玻璃门的目的是白天让自然光透进来.
但因为主语是玻璃门,而玻璃门不具备主动能力,所以用带有目的性的“to let”也不太合适.如果主语是“人们”,人们把木门换成玻璃门,用 to let 就比较合适.况且,分句间有了逗号一般就不能用 to do.
而letting 表示伴随状态,描述把木门换成玻璃门后带来的效果.
为什么不用 having let?因为 “让自然光透进来”这个动作、事件、情况是常规存在的；本句也不是为了强调玻璃门已经完成了“让自然光透进来”的动作,而是强调玻璃门的常规功效是让自然光每天都能透进来.
2,D ； 前一个填空,it 指代“任何可能的时间和地点都要练习英语口语”这件事,句子意思是“把这件事定成了规则”.后一个填空,如果用it,就应该是 it is possible；whenever+形容词如possible/ proper/ safe/ necessary 的用法是可以的,同理wherever也如此.
3,句子意思：如果没有合适的课程,你弹钢琴时可能（保持）很多坏习惯.keep up 保持.
其他选项是什么?
4,句子意思：我们一直盼望的这一天来了.
完成时态跟动词是不是延续性的没必然联系,它表示动作在过去已经完成,或者从过去一直延续到现在都在进行.
has come,就是“已经来了”,come的动作已经完成了.再比如,“已经走了”have gone,“已经完成作业了”have finished his homework--做对比“一直在做作业”have been doing his homework,要明确时间可以加上“since 1 hour ago”.

1.状语从句，导致的结果2.A，少了一个逗号吧，是it_is3.保持/留，持续，维持4.我们一直以来期望锝那一天已经来了5.C6.B