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问题 when doing, while doing

___________ arriving at the camp,the coach asked us to ski. I skied carefully,but....题目答案是when, 想问一下，还可以是while吗？when doing等于while doing?这里arrive 是短暂性动词，用了ing形式，表示“即将”吗？

问题 双宾语动词后面可以只跟一个宾语嘛

The boy主 is giving谓 his explanation宾 for why he arrived late to school(介词短语作定语 ，修饰explanation），

问题 that exchanges covet怎么理解

All that has helped make HKEX more hospitable to the tech firms that exchanges covet.请问这里的that exchanges covet怎么理解？我理解先行词应该是HKEX因为exchanges用了s，但是covet怎么理解呢，它也是个动词啊，我查了词典它没有名词性质啊。

问题 How long既可以表示时间和距离吗?

How long does it take from A to B? 这种可以表示时间。我想知道 How long is the bridge over the Yellow River? 这种常见吗？

问题 不定式进行式作后置定语的问题

如我想表达，下个星期将坐在这个座位考试的考生是ALICE，可以翻译为：The candidate to be sitting on this seat for the exam is Alice.

问题 whether后是否为强调句

...ers are unsure whether it was the United States or Mexico that decided not to send back families with young children.我自己判断是强调句。又觉得it是人称代词，指代后面的美国或墨西哥，但that作专有名词的限制性定语又解释不通了。谢谢各位大咖专家老...

问题 prevent能直接跟doing sth吗

比如The cylinders shall be secured with triangular wooden chocks to prevent rolling.这句话是不是错误的？应该改成prevent them (from) rolling.或者是把rolling改成名词prevent the roll.

问题 neither 后只能跟可数名词的单数吗

书上说neither 后只能跟可数名词的单数，例如不能说Neither the girls, 只能说Neither of the girls但是我看到这样一个例句：Neither the girls nor Tom is to blame.这是怎么回事呢？

问题 be hard pressed翻译问题

We will be hard pressed to cover all data structures or all methods for adding concurrency. 翻译：我们很难介绍所有的数据结构，或实现并发的所有方法。 整句话的意思很好理解，但是pressed的意思很难翻译出来。请教各位老师如何翻译pressed.

问题 定语从句关系词的选择

Which of the following words can NOT be used to complete "This is the place ______ I visited"？A．/B．whereC．whichD．that 答案是B。但是我觉得A也可以，因为visit既是及物动词也是不及物动词，因此不需要谁来做他的宾语。请老师指点。

问题 不定式做目的状语还是条件状语

老师您好，我请教两个问题：1. I feel terrible, I must see the doctor now. 这两句为什么可以连着用？因为口语吗？2. To make an omelet，you need a few eggs. 不定式作目的状语还是条件状语？谢谢！

问题 standard既可数又不可数（怎么区分）

比如说生活标准是living standard还是living standards？初中英语教材中有一句话：did homework carefully to meet the standards of a strict teacher，达到严格老师的标准，为什么用复数？

问题 专四考试的反意疑问句

前面是2016年专四考试第14题，后面是2014年的专四题目：Nobody heard him sing, did he? 不行，要用did they。为什么nobody wants to go there, does he就可以了?

问题 一道时态的选择题

I decide to leave the company next month, where I _____ for exactly three years.A. have workedB. is workingC. will be workingD. workE. will have worked F. will have working这六个选项中我觉得ADE这3个好像都可以，想请教老师，这三个哪个最合适，并且其他两个为什么...

问题 关于significant和obvious的区别

请问什么时候使用significant，什么时候使用obvious1. It is significant/obvious that he changed his will only days before his death.2. It's the first drug that seems to have a very significant/obvious effect on this disease.