题目内容

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?
B?
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。
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