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表示對(duì)過去有把握的推測,他們一定在過去那時(shí)玩得很高興。后面是否則他們就不會(huì)待這么長時(shí)間,這里也是對(duì)過去的可能性的推測。
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