动词的时态和语态,1By the time he realizes he

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每一题都要详细解释清楚哦~
1By 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.
2It 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.
3There ______a trend that 3D films will bee 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.
4You 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