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问题 once放在句首的用法

Once one of the largest and busiest cities in Taiwan, it is now part of Taipei.    此处once后面省略了it is么因为与后面的it is重复所以省略?

问题 accepted on to 怎么理解

We have seen a considerable increase in England in the number of women accepted on to full-time undergraduate degrees in science,technology,engineering and maths.

问题 为什么用feature而不用featured

That was shot in Paris and features Chinese pianist Lang Lang句子中的feature为什么不是featured形式？

问题 为什么要将but改成yet

求助老师们!The fruits are small in size, but juicy and tasty.此处为什么要将but改成yet?

问题 为什么用逗号连接句子

Glass packaging is used for many products, many beverages are sold in glass, as are numerous foodstuffs,as well as medicines and cosmetics.为什么用逗号连接many beverages are sold in glass?

问题 if that 是什么结构

Moreover, it had to be borne in mind that the hugest whales, those found near the Aleutian, Kulammak, and UmgullichIslands, have never been longer than 180 feet, if that. if that 是什么结构？

问题 until doing 与 until done

Being badly wounded and unable to move, he had to lie there until getting help.有人说这个句子有错或不妥，求专家分析，谢谢！

问题 against用法

...one, or its cloaca (泄殖腔) - a combined opening for urination (排尿) and defecation (排便). The gas release makes the orifice (开口) vibrate (振动) against an organism's (生物体的) sphincter (括约肌) muscles, creating a sound.这里的against具体什么意思？倚靠吗？

问题 关于动词时态、瞬间性动词和延续性动词

...ead recently?I _______ Learn English Tell China's Stories since last year, and now the third time.A. read       B. am reading        C. have read         D. had read.我的疑问：① read 确定是延续性动词吗？② I have read this book. 这句话里面，不是在说...

问题 动词hope可以用于进行时态吗？

看到这样一个句子：I’m hoping that you will come and have a chat with me. 动词hope可以用于进行时态吗？不是说表示心理活动的动词不能用于进行时态的吗？请教专家老师！谢谢！

问题 现在分词的逻辑主语分析

It is a true story of how the Boston Globe uncovered the massive scandal of child molestation and cover-up within the local Catholic Archdiocese, shaking the entire Catholic Church to its core.请问 shaking 的逻辑主语是？

问题 《傲慢与偏见》里的一句话

For what do we live, but to make sport for our neighbours, and laugh at them in our turn?请问这句话是什么意思？

问题 及物动词短语做谓语么？

The new aircraft will be subjected  to a test of temperatures of -65℃ and 120℃. 请教老师本句的be subjected to是不是相当于 及物动词短语 做谓语呢？

问题 动词feature的用法难点

Aside from shopping opportunities, there's a theater, a monorail, mini golf, a river (with actual boats) and even a beach resort featuring swathes of imported sand.这个单词 feature 很难理解，和汉语没有对应的意思，请老师分析一下。谢谢。 

问题 关于几个英语短语的解释

mover and shaker：有权势的人bring sth in its train：带来……的后果；stand sb in good stead：给某人好处，对某人有用请问，这三个短语具体怎么理解？谢谢（PS从字面上理解很困难）