...Unit 1里有这样一句：Only if you put the sun there did the movements of the other planets in the sky make sense.这里的 only 后面接的是if you put the sun there，这是一个条件状语从句。请老师说明 only 后接状语从句放在句首时的倒装。谢谢！
--Have you heard of the Chinese Zodiac Art Exhibition being held in the Palace Museum now? --Sure. Han Meilin, a veteran artist _____ no less than 600 new artworks in it. A. is presenting B. has presented C. will present ...
...______ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.A. Because B. For ...
例句：Since the beginning of 21st century, rapid social development has led to urgent need of new technologies to prop up the social progress.这个句子应该是正确的吧？其中to prop up the social progress，是什么用法呢？是宾补吗？还有类似的句子：Not considering such...
There is a good chance of silent genes surviving for up to 6 million years in at least a few individuals in a population.请问老师：1.红字部分是否可看做一个整体作句子的成分？作什么成分？2.up to 6 million years作什么成分？up在这里是什么词性什么用法？3....
... this way for months. So I went to my friend for help,who lived on the top of a steep hill.My friend wasn't in.The fog was rolling in.So I was B outside her house waiting. A.found B.stuck C.struck D.hurt 答案选stick，意思符合原文“因...
It was about seven or eight days ago ________ we heard the news that he had gone to London.这是一个强调句，空格处填that肯定是对的，我的猜想是：由于被强调的是时间，请问这里除了填that外，也可填when吗？
In fact , one serious side of the exhibition is that organisers also want to show that video gaming is an important industry, employing many skilled people.这里的employing 怎么分析呢？逻辑主语是组织者吗？
...the irony being that she was widely understood to have spoken out aginst it in the privacy of the committee.麻烦老师解惑 这句话的主句是啥啊？谓语动词是什么？ 我觉得红色地方就是个后置定语对吗？如果是的话没有谓语了呢 很不懂 。
A(主语)B（谓语）the basic themes and preoccupations of an unfolding , dominant puritan tradition in American intellectual life.解析说：红色的是宾语，绿色的是宾语的后置定语，为啥这后置定语之间要加个逗号，这是什么语法知识呢？
28. “We can’t go out in this weather,” said Bob, ____ out of the window. （2004·全国II）A. looking B. to look C. looked D. having looked这个题选A做伴随状语没问题。可否选D做原因状语呢，因为看了窗外后，他说了那句话？