答案:A
6.He used to be quite rich but something must have happened to him,probably problems with drink.他过去很富有,但是他一定发生了一些事,可能是关于酒方面的事吧。
【精讲拓展】
(1)辨析:used to do/be used to doing/be used to do
My father used to smoke,but now he is a nonsmoker.
I am used to living here;I don’t want to move to another city.
The old car is used to be a taxi by my dad.
(2)must have done表示“一定发生了某事”,对过去发生过了的事情做出肯定推测。
The lights were on;they must have been at home.
灯还亮着,他们一定已经回家了。
The room is so clean and tidy.It must have been cleaned.
房间如此的干净整洁,它一定被打扫过。
must do 表示“一定……”,对现在的动作和状态做出肯定推测。
He must be the wanted man: he’s exactly like his picture.
他一定是受通缉的那个男子:他和照片上的人一模一样。
注意:must表示推测时通常只用在肯定句中。否定句中用can’t。
(3)happen to...无被动
①happen to sb./ sth.发生(某事件);对……产生影响
A bad accident happened to that family.
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