He ____ the key, so we ______ into the office.A. hadn't left; can't B. didn't leave ;couldn't have got C. hadn't left; could't getD. hasn't left; could't get答案是B，还是C？谢谢!
the center of our planetary system was a difficult concept to grasp in the Middle Ages.A.It is the sun and not the earthB.Being the sun and not the earthC.The sun and not the earthD.That the sun and not the earth疑惑：这道题上课的时候...
The Bent Pyramid outside Cairo----ancient Egypt's first attempt to build a smooth-sided pyramid.A. has been believed to have been B. was believed to be C. is believed to have been D. is believed to be答案是C，因为建造金字塔，这个动作先于is believed发生。为什么C不行？把这...
For
example, the south of France and northern Italy experienced extremely heavy
rain and 1000km/h winds in November 2016.根据这个句子是不是可以理解为：表示在某国的东/南/西/北部，可以有两种不同的说法：the
south of France / southern Francethe
north of Italy / nort...
In 1913, it was
decided to change IWD (International Women's Day) to March 8, and it has been
celebrated on that day ever since.The day was only
recognized by the United Nations in 1975. It has created a theme each year for
the celebration ever since.请教老师：上面2句it has been celebrated o...
The event, staged 100 years after the publication of H. G. Wells' The Time Machine, referred to periods from the intervening century through surreal juxtapositions and magical fantasies. 请教老师：referred to periods from the intervening century的理解，读到这一句，怎么也...
题目：We firmly believe that ___ the new examination system comes into existence, completely new situations will arise.A. considering B. supposed C. providing D. given答案是C 为什么supposed不行呢 B和C之间的区别在哪里呢？
...g man still denies___the fire behind the store.A.to start B.having started C.start D.to have started2.The thief caught on the spot by the policeman denied___anything.A.to do B.to have done C.do D.doing以上两题deny后都是接Ving,但是为什么第一个题答案选B用完成体，第二个答...
We have entered into an age______dreams have the best chance of coming ture.A. which B.what C.when D.that老师，这道题选C，但为什么不可以是dreams 后面的话解释age的含义，作为同位语看，我觉得D也可以？