They must have been enjoying themselves there,otherwise they _________ so long.

They must have been enjoying themselves there,otherwise they _________ so long.

题型:不详难度:来源:
They must have been enjoying themselves there,otherwise they _________ so long.
A.can’t have stayedB.wouldn’t have stayed
C.needn’t have stayedD.couldn’t stay

答案
B
解析
must have done表示对过去有把握的推测,他们一定在过去那时玩得很高兴。后面是否则他们就不会待这么长时间,这里也是对过去的可能性的推测。
举一反三
The monkeys look sweet,but they _________ be very naughty.
A.mayB.needC.shouldD.can 

题型:不详难度:| 查看答案
—Did you visit the famous cultural relics last month?
—No,we _________ it,but we spent too much time shopping.
A.could have visited
B.must have visited 
C.can’t have visited
D.shouldn’t have visited 

题型:不详难度:| 查看答案
—The problem wasn’t difficult for him,was it?
—No,it wasn’t.He      a more difficult one.
A.should have been givenB.ought to be given
C.would have been givenD.must be given

题型:不详难度:| 查看答案
—Is John coming by train?
—He should,but he _________ not.He likes driving his car.
A.must B.canC.needD.may

题型:不详难度:| 查看答案
You _________ be hungry yet;you had a big cake only an hour ago.
A.may not B.mustn’t C.can’t D.needn’t 

题型:不详难度:| 查看答案
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