请问这是个什么句子 and hence后为什么主谓都省略了? and hence中的and和谁是并列关系？ Under modern conditions,this
requires varying measures of centralized control and hence the help of
specialized scientists such as economists and operational research experts.
...照应”，这个问题里，前面用的单数work
visa，但后面却用they来指代。我在一份听力文件中又看到了这样一句话，是与之相反的情况，不确定能否也用“语境照应”来解释这种情况：That’s
why I love going to musicals because it’s the perfe...
不定式可以做定语，例如：The boy to write this letter needs a pen. (to write this letter 为定语，修饰名词boy) /写这封信的男孩需要一支钢笔。There is nothing to do today.（to do为定语，修饰名词nothing）/今天没有事要做。请教一下老师，什么情...
They suggest a cause of the subsequent state of equilibrium or process
of simplification that would have to have come into operation at some time
after such a pre-historical development. 请问老师would have to have是什么用法？
...大量的时间观察马的动态和表情。翻译：Trained in France, the Chinese master studied
equine anatomy, spending hours observing horses'movements and expressions.请问老师：spending 在这里并不是非谓语中的动名词，为何在这里却能做主语？
...rcion should its more forceful commitment to its Western partners irritate the government in Beijing然而，韩国有四分之一的出口流向中国，如果韩国对西方合作伙伴做出更强有力的承诺，惹恼了中方，韩国恐会陷于被动地位。请问：这里的句子如何...
Though ostensibly a book about creativity, the author frequently veers off to discuss animal emotion and intelligence.麻烦请问亲爱的老师，though后可以只加个名词吗？是不是应该加个句子？
...ks carefully, who observes with curiosity, and who seeks to connect with the place he/she visits, with its history, its flavors, and its people.connect后紧跟一个with，这是什么用法？后面还有个with。