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1.Everyone passed the exam..It _________ difficult.

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1.Everyone passed the exam..It _________ difficult.
A.can’t havebeen B.must have been
C.couldn’t be D.might have been
但是看不懂耶.
2.--- why didn’t Tom come to the party?
---- __________you had done.
　A.It was because B.It was that
C.It was because what D.Because of what
我选的是D.但是正确答案是C,虽然好像感觉D放到句子里读起来怪怪的,不过还是不知道为什么选C
1.Everyone passed the exam..It _________ difficult.
第一题can’t havebeen表示对过去事实的否定猜测,must have been表示对过去事实的肯定猜测,这两个短语经常用到,需要记住；第二题,我个人也认为D是对的,如果选C的话It是形式主语,真正的主语为what you had done,但是不存在谓语,无法构成完整的句子,显然不对的.你不要太相信参考答案,参考答案出错时经常的事.
_____he had passed the exam surprised everyone Everyone espect Tom ______ passed the exam. The exam was very difficult.Only____(几个的)students passed it. —— Ed passed the exam surprised everyone. though Liming was weak in english , everyone passed the exam Everyone passed the exam except Tom. (同义句改写)_ It _____ （say） that Amy has passed the exam It's a___that he has passed the exam It is ( )惊讶that he has passed the exam. The test was very difficult,so(f )students passed it everyone in our class passed the exam ----- tina,so she was I passed the exam! ____.