The city at one time must have been prosperous, for it enjoyed a high level of civilization.想问下这句话中at one time 都可以放在句子的什么位置，可以放在been之后吗？还有must have been 是推测的用法吗，可以详细解释一下吗，谢谢~
1. They spend 3000 yuan each
month—about 60% more than the others’ spending.请问为什么破折号后面是非限制性定语，而不是3000
yuan的同位语呢？二者的区别是什么？2. He raises and helps to give out
1000 dollar.请问这句的谓语是raises and
helps，还是raises ...
老师，我在一个杂志上看到这么一句话：The most important thing a
father can do for his children is to love their mother.【一个父亲能为他孩子做的最好事情，就是好好爱他的妈妈。】我想问，这里谓语动词is后面的to改成that可以吗？两者的区别...
1 The speaker has
always been different, but is content being considered strange by others.请问：形容词content后面是现在分词短语作状语吗？2 I’m happy
working for this company.请问：形容词happy后面是动名词短语吗？老师，这个要怎么区分形容词后面是...
... involved high
risk, I went to a friend. He looked at me for a moment, and then wrote a
sentence containing the best advice I’ve ever had: Be bold and brave—and mighty
forces will come to your aid.请问句首的 once when...如何理解，如何翻译？
有这样一个句子：
Our boss is really a kind-hearted person—always ready to help anyone in need. 我们老板确实是位热心肠的人——总是乐于任何需要帮助的人。
这个句子破折号后面的祈使句的主语好像是our boss吧！这不是破坏了&l...
...bsp; （1）We asked for Mr Miller to be placed in a more responsible position.（2）（1）没有被动语态，是因为come不及物吗？（2）没有被动语态，是因为to be placed已经是被动的形式了，所以才没有被动语态的，对吗？请老师...
I've assisted in six esophageal resections, all of which were free of complications.老师，这里的all of which是不是类似于all of you? 我觉得which依然引导的是非限制性定语从句，指代resections。但是all of该怎么分析，把all of作为限定词修饰which的说法对...
In a trial ,a judge must decide which eyewitnesses to believe and which not to believe .这个句子是: a judge must decide (that) He is to believe which eyewitnesses.的省略句吗？还是a judge must decide to believe which eyewitnesses.是不定时的复合结构？
I will not be attending the White House Correspondents' Association Dinner this year. Please wish everyone well and have a great evening!有专家学者认为：这句话要么英文错误！要么逻辑错误！wish 就暗含了主语是第二人称 you，表示特朗普是在请别人替...