The library ______for more than 60 years since it _____ in 1940.
A. has been open; opened
B. has been opened; opened
C. has opened; was open
D. has been open; was open
正确答案为A。但 D 为何不可以呢？有资料说，当 since 引导的状语从句的谓语动词是延续性...
Isn’t it strange that he should have left without telling us. 真奇怪，他没说一声就走了。
请问上句中的“should have left”是一种{should have+Ved}结构——表“过去该做而实际上未做的动作（其否定形式则表【过去不该做...
...道关于情态动词用法的题目：
Her birthday was a week ago, so it _______ (can't / be ) on the 25th.
A. can't be B. can't have been
我不太明白25日是说话之后的日子，还是之前，所以不知道应该用对过去的推测，还是对现在...
—I knocked over my glass. It went over____keyboard.—You shouldn't put drinks near___computer.A. a; the B.the; the C.a; a D.the; a专家老师，您认为此题设置的怎么样？答案应该选哪个？
If it will be useful for Dr Watson to hear what I have to say.老师，为什么从句用将来时，条件状语从句一般不是主将从现吗？I need your help very badly. very badly 是修饰need，是非常的意思吗，这个词组用在其它地方会产生歧义吗？如 I love you very ...
He theorizes that it is the emotional component of these intangible prizes that make them effective. In fact, vaguely-stated possibilities of winning a prize were more effective than options with hard odds included.hard odds included翻译为 包括了更难的赔率 吗？不是很能理解这部...
...ed the name of the men (who) they knew (that)
you had spoken to.5.
It is exciting but nowhere near as
colorful.能否分析一下这些句子的语法结构，尤其是第五句！2,3,4句能否详细得讲解一下他们的语法结构和标红字体为什么可以省略？且第一句的ho...
...想办法解决废物处理的问题。Don’t give up hope .You can work it out. 别放弃希望，你会解决它的。Will you please help me to solve this maths problem? 请帮我解答这个数学难题好吗？The boy is clever enough to work out the math problem quickly. 这个男孩很聪明...
Many of us,in our desperate drive to be successful and care for our many responsibilities feel terrible guilt.在这个句子里，是不是to同时接“be successful"和”care for our many responsibilites"另外，不定式to be successful在此是否是作后置定语修饰drive.to+be+...
Everybody wears them(是上文的jeans),from the rural farmer to the urban lawyer and from models to housewives.But why have jeans become so popular.You will get many answers请问一下，why后面怎么没主语？是省略吗？