许多语法书和词典都说，英语习惯上不能将although与but连用，但是下面这句如何解释？
Soon he was President of the new South Africa. But
although he had suffered for so long, he did not want to take his revenge on the
white minority.
...这句摘自高中英语新教材人教版必修一 p5：Her first impression was that English was difficult and people spoke
too quickly, but soon she found that if she concentrates on the ideas, not the
single words, she could understand!请问句子中的 that if 引导的是什么从句啊？
Stronger than FM radio signals, these RF waves are still a billionth the intensity of known carcinogenic radiation like X-rays.本句中 a billionth the intensity 这几个单词连用，比较奇怪，billionth为什么后面直接可以跟名词呢？请教老师了，谢...
they are a collection of volcanic islands in the Pacific Ocean near the equator，about 600 miles west of south America.老师好，句子里的方位该如何理解？离南美洲的西部大约600英里？是不是等于 600 miles from west of south America？
...ogacy-friendly
state” in terms of the rights it gives to both intended parents—the
people who want a child but are unable to carry one themselves—and to
the surrogates. 依旧摘自《经济学人》。两个 it 均指加州。我觉得第二个 to 应该去掉，否则 both...and 连接的...
（1）-What gift do you plan to give your mother for her birthday? -Oh
I have forgotten all about it.（2）-Can you pour me some tea please Jenny ? -Are you sure? I
thought you preferred coffee.回答时到底使用，现在完成时还是一般现在时，有何区别？
Among the most important are sulphate aerosols: tiny particles produced by the combustion of coal and some sorts of oil
that float in the air, sully the lungs, kill millions—and also, by reflecting
away incoming sunlight, cool Earth.这个冒号的意义是做解释原因？这个冒号后面是...
I think the most
useful technologies are computers and the Internet, which can make our learning
more efficient and we all benefit from it.想请问老师这句话里面
we all benefit from it 的it
应该是代指 computers and the Internet
这样应该是双数，为什么不用these或者them...
... than is necessary.than指代long，做不了主语，从句缺主语？2. Be
brief and don't talk for longer than is necessary. than指代long
time ,than指代time，作从句主语？这样加了一个time合适吗？He
worries more than is necessary. 他担心过度。than指代much，是状语...
...d children do not do well in school. Down the road, those affected may not be able to get as good of a job as they could have, had they been well-fed. Sullivan added that it also prevents them from being able to contribute to society, and the economy, and they would have in a healthier environment....