Had the government and scientists not worked together, AIDS-related deaths _____since their highest in 2005.这题的答案是would not have fallen，而我觉得是would not fall, 从句是对过去情况的虚拟倒装if the…scientists had not…,但主句用的是since+时间点，不应该是...
...ence to talk about why sth was done or whether
it should have been done or not（用于句尾，谈论某事为何或是否应该做）究竟，到底，当初：I still don't understand why you chose that name in the first place. 我仍不明白，你究竟为什么取了这么个名字。I should ...
...pproached the task by first looking at how languages are connected to one another, rather than viewing them in isolation. They then decided to see if this was a good predictor of how many famous people spoke a given language. If a language is well connected to others (a “ hub ” language with man...
...到这样一个句子：If you have been introduced earlier to someone, do not assume that the person would remember you and be prepared to reintroduce yourself should it be necessary. 从“have been introduced”和“do not assume”和“be prepared”来看，这句话讲的是现在的情况...
"not to mention"这个不定式，在做分句的时候后面可以加什么类型的词？而且它所组成的分句在句子中充当什么成分？
例如"He has ten big houses in this country, not to mention his villa in France"这个句子中的not to mention在句子中起什么作用？还...
有人认为，英语要用 not...all 而不是 all...not 来表示部分否定。如：通常说：Not all lawyers
have large incomes. 而不说：All lawyers don't
have large incomes. 但是，下面这句如何解释呢？All that glitters
is not gold. 发光的东西未必都是金子。
...2.A three-good student ________ have done such a thing.答案里有could not, may not和might not，可以是选了could not,解释是英语里一般不会用may和might的否定完成式，请问是为什么呢？3. He _may have missed_ the train.说划线部分不能用may not have been, 要说...
FEMALE PROFESSOR: But coping with salt is not the only challenge for plants in a salt marsh. Soil there is dense and very low in oxygen.FEMALE PROFESSOR: So spartinas have air tubes.Air enters through tiny openings on the leaves.FEMALE PROFESSOR: The tubes provide a direct pipeline fo...
I cannot describe the unmeasurable contempt he put into the two words."Don't you want fame? It's something that most artists haven't been indifferent to.""Children. How can you care for the opinion of the crowd, when you don't care twopence for the opinion of the individual?""We're not all reasonabl...
There are _____ pens ______pencils in the box.A not, and B no, and C no, or1）not否定的是动词，那么pens和pencils是并列的，A选项是否可以？2）B、C选项区别在于用or还是and。这个答案应该选哪个？其他两个选项错在哪里？
...时，是否只要动词have done 和 do之间改变就可以，而 need not 和 did not need to 随便用哪个都可以吗?need not have done / need not dodid not need to have done / did not need to do这样对吗？