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They must have been enjoying themselves there,or they __________ so long.

A.wouldn’t stay B.needn’t have stayed

C.wouldn’t have stayed D.couldn’t stay

 

C

【解析】

试题分析:考查虚拟语气。句意:他们一定在那里过得很愉快,否则 不会呆那么久。根据 They must have been enjoying themselves there是表示对过去的肯定推测,故表示对过去的否定虚拟,故C项。

考点:考查虚拟语气

 

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