— It _____ a comfortable journey .
A . can\'t have been B . couldn\'t be C . mustn\'t have been D . shouldn\'t be
四、要注意情态动词的常用形式的反常使用。
1 . should 和 ought to 后接动词原形，常表示“应该……”；但也可用来表示推测，意为“想必会……”。如：
( 1 ) It\'s nearly seven o\'clock . Jack _____ be here ar any moment . ( NMET95 )
A . must B . need C . should D . can
句意为：“快七点钟了，想必杰克随时会到的”。正确选项为 C。
( 2 ) — When can I come for the photos? I need them tomorrow afternoon .
— They _____ be ready by 12∶00 . ( NMET98 )
A . can B . should C . might D . need
句意为“ — 我什么时候来取像片呢?我可是明天下午需要这些像片。”“ — 像片想必会在 ( 明日中午 ) 十二点以前洗出的。”正确选项为 B。情态动词表示推测，语气由强到弱的是：must ( 一定会 ) →ought to / should ( 想必会 ) →can / could ( 可能 ) →may / might ( 也许，或许 ) 。
2 . could 后接完成式常表示“ ( 过去 ) 可能……”，但也可用来表示责备语气，意为 “过去 ) 本来能够……， 而实际上却未…… ”。如：
— We could have walked to the station ; it was so near .
— Yes . A taxi _____ at all necessary . ( NMET92 )
A . wasn\'t B . hadn\'t been C . wouldn\'t be D . won\'t be
该题虽是一道考查动词时态的考题，但从“We could have walked to the station”可知，实际不是步行去火车站的。结合下句可知是坐了出租车去的，时间是过去，故正确答案是 A。
【指点迷津】
Look 短语动词归纳
1 . look after 照看，照顾，负责处理。
I can look after myself .
She\'s been looking after the luggage .
2 . look at 看 ( 问题 ) ，看待。
That\'s the way I look at it .
He looks at a question from all sides .
3 . look back ( on ) 回顾，回想 ( 过去 ) 。
I like to look back on my high - school days .
If we look back , we realize the changes the war has made .
4 . look down on/upon 看不起，蔑视。
I wish you wouldn\'t look down on this kind of work .
In her days women were looked down upon .
5 . look for 找寻，自找 ( 麻烦等。 )
I’ve been looking for you .
They\'re just looking for trouble .
6 . look forward to ( 跟名词/动名词 ) 盼望，希望。
They looked forward to seeing him again .
The children are looking forward to the New Year .
7 . look in 作短语时间的访问/参观， ( 顺路 ) 到某处去一下。
I\'ll look in this evening to see how he is .
I\'ll look in at the shop on my way home .
8 . look into 调查，了解，研究。
We\'ll look into this matter together .
The police are looking into the records of the thieves .
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高二英语第十九单元A Freedom Fighter