是a used typewriter还是an used typewriter?

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• 一个很难的高中英语单选题----高手帮忙In my opinion, life in the twenty-first century is much easier than _____ .A：that used to be B：it is used to C：it was used to D：it used to be答案是D,但是我看不懂D项,it是代指life的对吗?重点说一下it used to be 后面是不是省略了东西?如果是完整的,我怎么也理解不了,怎么可能以be结尾呢?
• 先行词是the way,place,time,reason关系副、代词何时可省?为什么这句要加where:We've all used thermometers to measure temperature but sometimes we need to measure temperature in places WHERE you can't put a thermometer.语法说,先行词是the way,表示方式,可用that（可省）或in which来引导一个定语从句.如果先行词是时 间或原因,也可用that（可省）或when或why来引导定语从句.如：（1）This was the reason that/why he was late yesterday.（2）This is the last time that I shall give you a lesson.这句是道改错题,还要加上where 是什么原因?没表达清楚，我的意思是that代替关系副词，那么我这道改错题为何还要加
• be used to do sth 的句型意为‘’被用来做某事‘’是吧.它的be的时态怎样变化.什么时候是一般现在时,什么时候才用一般过去时.最好列几个例子.
• My mother used to ask me what is the most important part of the body这是书上的原句,我的问题是从句中is的位置正确吗?我查了百度 有的写在后边,有的在中间,难道是很随意放哪都可以吗
• My mothe used to ask me what is the most important parrt of body.中what引导的是什么重点我是不理解what后面的的一大堆东西是什么结构?疑问词加陈述句语序?疑问词加一般疑问句语序?不懂.
• 我有一个英语动词时态填空题不会了题目是what was happening,what happened,what used to happen?做题；while my wife______(work)in the kitchen,i______(sit)in thegarden.i______(look)at cars which_____(pass)in the street,when asmall car_____(stop)outside my gate and a man_____(get)out.i was most surprised to see that the man was Tad Hale.we______(be)at the same scholl years ago.in those days.Ted______(come)to our house nearly every day and we often_______(go)out together.we ___(be
• the company had about 20 notbook computers but only one- third __were______ used regularly.Now wethe company had about 20 notbook computers but only one- third __were______ used regularly.Now we have 60working all day long.为什么用过去时,不是regularly经常吗,我觉得应该是现在是
• 大哥大姐们 I am one of the few people left 这句话的left是离开的 还是留下的?Aeroplanes are slowly driving me mad. I live near an airport and passing planes can be heard night and day. The airport was built years ago, but for some reason it could not be used then. Last year, however, it came into use. Over a hundred people must have been driven away from their homes by the noise. I am one of the few people left. Sometimes I think this house will be knocked down by a pass
• 1.He is ill easily 他容易生病 可以这样说吗2.it has ____ use besides is used to a drink. 填 much 还是 other 还是 ?
• that 和 it 作代词时的区别比如 life in the twenty -first century is much easies than _used to be .应填that还是it?请说明理由!
• 设f(x)为三次多项式,已知f(1)=f(2)=f(3)=6且f(4)=12,试求f(x).
• 4.f(x)为三次多项式,已知f(1)=f(2)=0,f(0)=2,f(-1)=-6