The physical properties of the modified SC are listed in Table 3, which were obtained by parallel tests, and their values of the standard deviation were all less than 0.33%.最后面的the standard deviation were all less than 0.33%.中的were对吗？是不是要使用现在时才对？
...ts outside and bring them to their owners. This is a very
old habit that's been present in all kinds of predators (食肉动物). Cats bring gifts for their owners
to show they love you. These adorable little hunters are just doing something
that it's been in their nature since the beginning of time...
If ever the earth has noticed a system of administration conducted with a single and keen eye to the general interest and happiness of those committed to,it must be the system protected by truth,to which our lives have been devoted to.求教前半句的意思，分析一下句子结构。
...__.A. I was not called awayB. nobody would have called me awayC. I had not been called awayD. nobody called me away请问老师，这题if引导非真实条件句，为什么主句又用的过去将来完成时？还有请问怎么区分陈述语气的时态和虚拟语气呢？提前谢谢老师！...
Ok, we've been talking about how throughout history, it was often difficult for people to give up ideas,which had long been taken for granted as scientific "truths," even if those ideas were false.请问这里的how是什么用法，是常用的吗？
...onal postal service, but Paulo’s hunch (直觉) paid off.Today his hobby has developed into the website
postcrossing.com, a social network that has grown to 575, 217 registered users
in 214 countries and regions since he started it 10 years ago. On August 5, the
number of postcards exchanged by me...
But college has never been able to work its magic for everyone. And now that close to half our high school graduates are attending, those who don’t fit the pattern are becoming more numerous, and more obvious. 请教老师，that 指代的是后半句的those who吗？ that close to ...
No one wanted to talk to me about my adventures,or to learn about my country. All they wanted to do was talk about mathematics and music.请问老师，all 后面省略了从属连词that吗？还有……to do was (省略了to吗）talk about...
Scientists generally hold that language hasbeen so long in use that the length of time writing is known to cover is trifling in comparison问：本句如何翻译，that the length of time writing is known to cover如何理解？
Food is traditionally obtained through farming, ranching and fishing with hunting, foraging and other methods of subsistence locally important. 句中的 with hunting, foraging and other methods of subsistence locally important.with+n+adj 复合结构做句子什么成分？怎么翻译？
...ion with pandas goes back to
my days on a TV show in the mid 1980s, when I was the first Western TV reporter
___66___ (permit) to film a special unit caring for pandas rescued from
starvation in the wild.这道题的参考答案给的是填过去分词permitted，但这道题能不能填不定式的...
The school hasbeen asked to take certain
actions to fix the problem.学校被要求采取行动解决问题。这个句子为什么用take certain actions？不是说take action
中的 action 不用复数吗？难道是因为action前面有certain修饰就可以了？
Hellen ___ with her class if she had been able to meet all of the course requirement in timeA. will graduate B. would have graduated C. would graduate D. has graduated答案选B，但是想问问可否理解为错综条件句，选c呢?