used to 是情态动词吗?

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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?
• 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
• drive sb mad这个动词前面要be吗The bus drive me madThe bus is driving me mad是主系表结构还是主谓宾啊
• 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
• 不是及物动词后面要跟宾格吗,think是及物动词.I think they are great.为什么they 不用宾格呢?
• 问下关于这两个句子的语法问题.The author,taking the reader on a chronological journey through her native land,skillfully combining history and legend with fragments of fiction.2 Modern bluegrass songs,telling of love and despair and celebrating mountain beauty,reflect the genre's rural origins.第一句的taking.land,是作为插入语吗?为什么这里用taking开头做动词就错了（答案写的这句话这部分是错误的改成who takes the reader.）而第二句话telling 开头的插入语整句话就是对了的.而且为什么第一句话后半句要用combining而不是combine,这里难道不属于主语+分词的错误码?
• 1.i like goldfish because they are beautiful and they （make no noise.）请问括号内的能这样表达吗don't make noise.2..it sounds fun to (用纸做衣服听起来很有趣).根据所给的汉语意思补全句子.请问为什么不能这样表达：use paper to make clothes.答案是make colthes out of paper.3.Ants smell very well ,let's watch them when we are free.请问 smell 是系动词,为什么well不能换成good 呢4.he 'd never bark or bite.请问'd是would 为什么不用will呢此处.
• __about a tall building.A.Think B.Tinking C.Thinks D.Thought正确答案是A.但不是说动词作主语要加ing吗?为什么不选B呢?
• This factory produces steel 中为什么produce 要加S 是因为第三人称单数吗如果主语是复数 那谓语动词要用什么形势 给我答题的
• she is playing the piano now (is playing 是be动词+实意动词—做谓语）吗?now在句中做什么成分?是做状语修饰"piano"吗?
• 用15米的竹篱笆靠墙围一个面积为56平方米的长方形,若长方形的一边长为x米,可得方程要快啊
• 仿照《答谢中书书》,多用四字词语,写出一篇小短文.要求：1.语言简洁,或优美生动,或朴素而蕴含深意.2.不少于100字.