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问题 because在这里有什么作用

Not only is smoking bad for your health,it's the source of social  problems in developing countries because, since profit from tobacco is very high, tobacco has taken up the best food-growing areas,leading to food shortages.请问 because 在这里有什么作用？

问题 work out的语态问题

—Mark has a project to design,so he is busy with it these days.—I know. And I hope it will ____out fine in the future.A. be worked   B. work学生认为该题不严谨，认为B答案好过A。盼望专家老师权威解析。

问题 hand 作及物动词与不及物动词的疑问

"Hand in your homework!" she repeats 3 times to emphasize its importamce.老师，如何理解 hand,及物动词吗？为什么没有宾语的？

问题 over的用法

Normally, Americans do not assess their visitors in such relaxed surroundings over prolonged small talk; much less do they take them out for dinner, or around on the golf course while they develop a sense of trust and rapport. Rapport to most of us is less important than performance. over的用...

问题 so的用法（perhaps catastrophically so）

老师们好，句子最后perhaps catastrophically so中，so指什么呢？But there is a risk that such changes will make some plant infections more common in all climatic zones, perhaps catastrophically so.

问题 定语为什么不能用where引导

...and the opportunity to open up markets in regions that we don't currently sell a lot to is a great one.这里的引导词为什么不可以是where呢？另外is a great one修饰谁？

问题 worried about分词短语还是形容词短语

Worried about the time available,Zhang Pingyu had made a list of the sites she wanted to see in London .划线部分看成形容词短语好还是分词短语

问题 same后的略用法

The company which was created in the summer of 1999 would not have many of the same men left by the time the company celebrated the 20th anniversary celebration.以上句子修改自一本英文书籍中的句子。这个句子里the same men后是否省略了“as the company created”？单单一...

问题 what 在句子中作什么成分

在一本书里看到一句话：I expressed the hope that her son would go on to accomplish what she had hoped for him in the position which he then had.请问这句话中的what 作什么成分？

问题 为什么这里用is

Pastry is a food made from flour, fat, and water that is mixed together, rolledflat, and baked in the oven.is mixed 为啥？that的先行项是什么？

问题 hug their way through 分析

No all bees hug their way through the cold.不是所有的蜜蜂都能在寒冷中紧紧地抱着一起。their way 是 hug 的宾语吗？  还是their way其实是副词状语=in their way=按照它们的方式, hug 是不及物动词 ？

问题 同位语远离修饰词

our mind liking, unless actively prompted, to reduce most of what we have been through to headings rather than the full story, a document which it shelves in remote locations of the inner library.这里a document是our mind liking 的同位语嘛？还想请教一下，同位语可以指代句子，...

问题 as 非限制性定语从句

_____ has been stated in the annual white book,our national defense budget per year is well below the average of develpoed countries.选项是as ,如果我想用as it has been.......这个句型，不是as引导的非限制定语从句，原句子怎么改？

问题 going on在句中充当什么语法成分

There is generally very little unnecessary work going on in a good company.曹老师您好，句子中going on是作动名词修饰work充当名词短语，还是现在分词作状语？

问题 为什么用sat不用sitting

语法The old man sat in front of the television every evening, happy to watch...这里为什么用sat 不是 sitting？是不是有错误？如果无误，那么这是什么用法？做什么成分呢？还有这句话里逗号是个什么意思？是为了防止句子歧义吗？