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15.(06陕西19)
As you worked late yesterday，you have come this morning.
A.mayn’t B.can’t C.mustn’t D.needn’t
答案 D
解析 句意为：既然你昨天工作得那么晚，今早上你就没必要来了。从意思上显示选择项表示“没必要……”。
16.(05湖北33)
If I plan
to do anything I wanted to，I’d
like to go to Tibet and travel through as much
of it as possible.
A.would B.could C.had to D.ought to
答案 B
解析 句意为：如果我能计划做任何想做的事，我想去西藏尽可能地游览一番。观察一下句中的时态，因为都是过去时，句意表示与现在事实相反的虚拟语气，因此此处应用情态动词的过去时，表示的意思是“假如我们现在能够……”，could表示不存在的可能性。
17.(05重庆33)
I was on the highway when this car went past
followed by a police car.They at
least
150 kilometers an hour.
A.should have been doing B.must
have been doing
C.could have done D.would
have done
答案 B
解析 must have done用于肯定句中，表示对过去事情的推测，意为“想必是，一定是”。否定句、疑问句中对过去情况的推测，要用can/could
have done的形式。
18.(05山东34)
He paid for a seat，however，he have entered free.
A.could B.would
C.must D.need
答案 A
解析 paid暗示时间上指的是过去，could have
done用于肯定句中表示本可以做而未做的事情；肯定句中不用need have done; must
have done与语境不吻合。
19.(05江西22)
—Tom is never late for work.Why is he absent
today?
—Something to
him.
A.must happen B.should
have happened
C.could have happened D.must have
happened
答案 D
解析 本题考查情态动词的用法。must have
done的意思是“一定发生了某事”。由对话所提供的情景可知：汤姆从不迟到，所以他“一定有事”。因此D项正确。
20.(05安徽26)
Helen go
on the trip with us，but
she isn’t quite sure yet.
A.shall B.must C.may D.can
答案 C
解析 此题考查情态动词的用法。may表示一种可能性。如果没有具体的语境的话，B、D两项也可以选，但是意思就不同了。
21.(05江苏31)
—The woman biologist stayed in Africa studying
wild animals for 13 years before she returned.
—Oh，dear!She a lot of difficulties!
A.may go through B.might
go through
C.ought to have gone through D.must have
gone through
答案 D
解析 考查“情态动词+have done”。从语境分析，表示某人一定干过某事，而且是对过去情况肯定的推测，故应用must have
done。C项相当于should have done表示对对方的责备，意思是“应该做而未做”，在此不符合题意。
22.(05江苏33)
—Don’t you think it necessary that he to Miami but to New York?
—I agree，but
the problem is he
has refused to.
A.will not be sent;that B.not
be sent;that
C.should not be sent;what D.should
not send;what
答案 B
解析 not be sent是虚拟语气，相当于should not be
sent。
23.(04重庆24)
“The interest be
divided into five parts，according
to the agreement made by both sides，”
declared the judge.
A.may B.should C.must D.shall
答案 D
解析 考查shall的习惯用法。shall与第二、三人称名词连用，表示义务，责任，决心，许诺，它可以用于条文中；should/must用于口语中。
24.(04重庆29)
There are eight tips in Dr.Roger’s lecture on
sleep，and one of them
is: to bed early
unless you think it is necessary.
A.doesn’t go B.not
to go C.to going D.don’t go
答案 D
解析 祈使句的否定形式是在句首加don’t。
25.(04全国Ⅰ29)
—Isn’t that Ann’s husband over there?
—No，it be him.I am sure he doesn’t
wear glasses.
A.can’t B.mustn’t C.won’t D.may not
答案 A
解析 考查否定的推断。can’t不可能；must not不许；won’t将不会；may not可能不。根据“I’m sure he
doesn’t wear glasses（我确信他不戴眼镜）”可知，说话者的态度是：不可能是他。
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