问题 and后用第三人称单数的形式

As a discovery claim works its way through the community, the interaction and confrontation between shared and competing beliefs about the science and the technology involved transforms an individual's discovery claim into the community's credible discovery.句子来自2018考研英语阅读真题...

问题 一个句子可以用2个连词吗？

Rich as he is, (yet) I don't envy him.As是连词，引导让步状语，如果加上yet, 即：Rich as he is, yet I don't envy him.这里yet是连词：然而的意思， 请教老师一句话可以有2个连词吗？

问题 这个句子的one reason是同位语吗

Poor shipping experiences can lead to customer attrition, one reason that lead-time is so important in shipping.请问这个句子的one reason的语法怎么理解？首先，that引导的的是定语从句修饰reason，这个没错吧？整个句子是不是可以改成下面这个定语从句？...

问题 一道独立主格考题的疑问（PETS四级考题）

_________, the inhabitants fled.A. The city take B. The city having been takenC. Having taken the city D. The city being taken请问老师：此题答案选什么？

问题 But perhaps the most vivid recollections are those

问题 By the end of last month可以搭配哪些时态

问题 关于the drop-out rate among students(学生的辍学率)

The drop-out rate among students is currently one in three. 现在学生的辍学率是三分之一。请问这里用介词 among 合适吗？为什么不用 of 呢？

问题 The tiger is in danger of becoming extinct.中的冠词难点

书上说The tiger is in danger of becoming extinct. 中的定冠词不能换成不定冠词，不是说定冠词和不定冠词都可以表示类别吗？为什么就不能用不定冠词呢？

问题 than usual 的语法分析

I had supper earlier than uaual. 这里词典把 than 归为介词，后面的 usual 为形容词，这里怎么理解呢？原句为than I was usual吗？What gets Twitter users more excited than a year's supply of Wendy's chicken nuggets?这里的than视作介词吗？

问题 人物头衔的表达

…he was Donne the courtier,the lover,and the soldier. 这里的Donne the courtier是什么结构？

问题 unlucky是名词吗

But after forty days without a fish the boy's parents had told him that the old man was now definitely and finally salao，which is the worst form of unlucky, and the boy had gone at their orders in another boat which caught three good fish the first week.of unlucky这里的unlucky是名词吗？

问题 Zacharias heard the door close. 为什么宾语从句和主句的时态不一致？

如题，这是我在柯林斯词典中看到的例句，我觉得应该是  Zacharias heard the door closed. close使用一般过去时态。为什么使用一般现在时态呢？

问题 可数名词表类别时前用不定冠词a还是定冠词the

...             D.the正确答案为the, B为什么不可？

问题 without registration, registering, being registered的区别

A marriage without registration/registering/being registered is not allowed.请问这句话，用registration/registering和being registered，是否都可以，有什么区别？

问题 请问这句话里out of表达什么含义

我对上面图片这句话里的out of表达不理解，请问是否应该改成…can not see out with one of my eyes才正确？