James has just arrived,but i didn't know he___until yesterdayA. was coming B.came老师您好，为什么这里答案用的是was coming，过去进行时代替过去将来时，而不是用came代替过去将来时呢过去进行时可以用来在时间或者条件状语从句中代替将来时...
...不可以用在句子中：once every three seconds 3秒一次once every five minutes 每5分钟一次但是我在外国网站上读到这么一句话：The Deutz study on a Euro I engine, Figure 2, showed a BSFC penalty of about 1.8% per 10 kPa back pressure increase when back pressure exceeded...
经济学人里的句子，请问第二句话的语法是不是有问题？But in 2012 the KNU signed a truce with the army.It later joined the peace process, progress on which has been touted by Aung San Suu Kyi as her priority since she became Myanmar’s de facto leader in 2015.
题目：You should open an account at the online bank first, after _______ you can buy anything online. Let's check it out online.答案：which我想问的是 after 能不能当做连词看，如果能，是不是可以填 that？如果不能，请老师给以指导，谢谢！
And the three of them walked off in a whispery little group. It was the yuckiest feeling in the world.in a whispery little group是什么意思？yuckiest是形容词的最高级吗？in the world 是什么意思？
The problem is that catalysts and membranes have been expensive until recently.请问这里catalysts and membranes是最近才开始变贵，还是从以前到最近一直都是这么贵，还是说以前一直贵，但最近不贵了？还请教 until recently 是否有多种不同的用法？
...个句子：One day when entering your home, your mother says your family is having dinner with the family of one of her old friends. “when”是引导的定语从句修饰“day”？还是one day是后面这个状语从句里的，为了强调提前了？谢谢老师。
1.In fact,people are always the ones who mostly concern about the world peace.2.This is a novel concerned peasant life after reform.如第一句中为什么用concern是错的，而用 are concerned？（关心为什么需要被动？）第二句中我用concerned正确吗？