I drove it into a lamp post的it为什么在drove之后into之前

答案选A.has walked.
此题考查动词时态.根据句意“截止到他意识到的时候,他已经走进了一个陷阱”以及by常和完成时连用可排除B.而且realize用一般现在时的单数第三人称形式,以及后句中用一般将来时,所以选A.has walked.

has fallen

has walked
句子分析,by the time 到XX时候,he realizes,到他意识到XX的时候,he (walk) into a trap,进入了陷阱,it will be too late for him to do anything about it.那对他来说太晚了而不能做什么了.
所以句子的意思应该是到他意识到他进入了陷阱的时候,就太晚了.
为什么会太晚,当然要已经,要表示已经就是完成时.另外,he realizes后面接的是一个宾语从句,宾语从句和正常的句子一样,有自己的主语谓语宾语,根据时态realizes分析,要是现在完成时

每一题都要详细解释清楚哦~
1
By the time he realizes he ____into a trap ,it 'll be too late for him to do anything about it.
A walks B walked C has walked D had walked
我的答案B 正确答案：C
疑惑：选C不就意味着,他一直意识到自己····知道现在 ,这明天不就是错的嘛?
首先改你一错,about后有it.
答:你怎么会选B呢?这讲的是未发生的事情!选项应在A与C之间考虑才对.
译：C等到他意识到他已经走入一个陷井时,一切都晚了,他什么都做不了（一点办法都没有）.
析：by the time=by the time when-定语从句,意为“到了（那）时,”,也可以认为相当于when,译作：当.时,主将从现,所以用realizes,后面的宾语从句he has walked in the a trap,强调的是结果.他已经走进了一个陷井,但不能马上意识到,等到意识到时,一切都晚了.
2
It is said that the student ______seriously ill for two months last semester
A was B is C had been D has been
我的答案：D 正确答案：A
答：又一陷井!
译：据说那学生上学期病得很重,有两个月之久.
析：不要以为只有现在完成时才可以与for+一短时间连用,一般过去时也可以,表示“过去一短时间里连续发生或存在的情况”.近几年模拟常出这类题.这一题选C的也很多.
3
There ______a trend that 3D films will become more popular ever since the film Auatar hit the market
A has arisen B arose C is arising D will arise
答：A.
译：自从电影《阿凡达》票房大卖以来,已经出现了一种趋势,那就是3D电影将更加流行.
析：there has arisen a trend （+that 同位语从句） even since sth.happened.
本题考查时态,如能正确断句,不为中间的同位语从句所干扰,此题不难.
4
You didn't lock the back door .
------you are wrong.I______
A have locked it B lock it myself C did lock it D do lock it
为什么不能选A
答：C
译：你没锁后门.
你错了.我的确锁了的.
析：注意责怪者说话的时态,是过去时.强调过去他没有锁后门.他没有说：You haven't locked the back door.如果是这样,则选A.事实可以证明,现在的后门还是锁着的!
而现在（说话时）后门是开着的.（具体原因不清楚）,回答者不能说：I have locked it.因为现在完成时,强调动作对现在的影响和结果（是锁着的）.回答者只是强调：我当时的确是锁了的.言下之意,现在后门开着,另有原因,责任不在我（我当时还推过一下门的,我记得很清楚!）
5
--------I ____ downtown to the shopping centre soon .Coluld I get you something
-----No ,thanks ,I will do e-shopping
A was just going B am just about to go C have just gone D am just going
为什么不能选B
答：D
我打算一会上街购物,要我给你带什么吗?
不了,我网购.
析：表示位移的动词（来去动词）可以用现在进行时表示“最近的将来的计划、打算”.可以和表示最近的将来的时间状语连用,如：I am leaving for Shanghai tomorrow.
be (just) about to do sth.一般不与soon,in two miniutes这样的时间状语连用,一般用于句型：sb.was just about to do sth.when sth.unexpected (suddenly) happened .意为：正准备做某事,就在这时,一件意想不到的事情突然发生了.
6
What _____during a person's early years may affect the rest of his life .
A happened B has happeded C happens D happening
答：C
译：一个人早年发生的事情对他的后半生可能有影响.
析：本句讲的是一般的情况,用一般现在时.
评：本题有两处不当,1.what happens to him这个to him不省略更好,强调发生在他身上的事情,与他有关的事情,这个世界上每天发生很多事情,很多事情我们根本不知道却每天都happens,这些事情,对个人是没有影响的.
2.B项意为：已经发生了的事情,与C一样,也是现在时态,只不过强调已经发生过了的事情会影响余生.意思也通.这个选项最好改一下.
7.The survey conducted indicates that nearly 80% of the Chinses feel that pressures on them are much heavier than before while their incomes ___
A would increase B have increased C will increase D increased
答：B.
译：调查表明,近八成的中国人觉得压力比以前更大,尽管收入（已经）提高了.
析：while=though,近年常考.
PS：这几个题出得不错!问题也不错.

drive into在有些词语书上可能被翻译成"撞倒",但是各种语言的词汇都有它使用时的语境,如果你经常看英文报纸或杂志,会发现上面有很多在我们看来是不通甚至是错误的句法.我对次序不怎么感冒,就我个人理解吧,I是主语,后面跟了drove...into...这个词组作谓语,当词组后面是介词时,it作为宾语放在词组中间,lamp post大概就是状语了吧（这个不太清楚）,我也就只知道这么多了.