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 stayed | B．wouldn’t have stayed | | C．needn’t have stayed | D．couldn’t stay |
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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．may | B．need | C．should | D．can |
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—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 |
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—The problem wasn’t difficult for him,was it?
—No,it wasn’t.He a more difficult one.| A．should have been given | B．ought to be given | | C．would have been given | D．must be given |
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—Is John coming by train?
—He should,but he _________ not.He likes driving his car. |
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 |
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