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 ...
(1) The decision (that) whether or not to salvage the wreck was not an easy one, although an excavation in 1978 had shown that it might be possible to raise the hull.(2) The hope that he may recover is faint.请问：是否可以认为 decision 后面省略了that？是同位语从句吗？
But caloric restriction, it kind of shocks the system, and one result is, well, those monkeys on the calorie-restricted diet had lots more naive T-cells left than you'd expect in monkeys that old.请问老师：句子里的lots是副词吗？left是后置定语还是left than...是T-cells的后...
...f the signal and noise travelling down the communication channel, and on its capacity . 问题1：第一个and并列的成分是哪两个？问题2：travelling down the communication channel是什么成分？是现在分词作状语吗？还是作定语修饰noise/the signal and noise？如何...
... in global heating, according to
a new study, prompting warnings that humanity is financing its own extinction. 请问老师：句中的driving和prompting作的都是什么成分？prompting是状语吗？但是逻辑主语是谁呢？找不到它的逻辑主语啊！这是悬垂分词吗？
...elves which person in our lives means the most to us ，we often find that it is those who， instead of giving much advice， solutions or cures，have chosen rather to share our pain and touch our wounds with a gentle and tender hand.我知道instead of...是插入语，而后面rather是什么意...
...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...
The first semester of my junior year at Princeton University is a disaster, and my grades show it. D's and F's predominate, and a note from the dean puts me on academic probation. 1、D's and F's是什么意思？has的意思吗？2、put在这是使....处于什么状态的意...
____was the day before yesterday? It was Wednesday, the 2nd.A. What day B. What C. What time D When答案选择B请问这道题，是不是因为答句里既有星期又有日期，所以what后面day和date都不加，以此来对应答句的问题？还是说这道题就是错的，B选项落了...
...句：The name makes me more qualified to be football player than an art critic.可否补充为The name makes me more qualified to be football player than it is an art critic. than作为比较代词，是代替qualified to吗？如果不对，than怎么替代形容词短语？另外一种情况可...