They must have been enjoying themselves there, or they______so long.

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问题 They must have been enjoying themselves there, or they______so long.

选项 A、can’t have stayed
B、wouldn’t have stayed
C、needn’t have stayed
D、couldn’t stay

答案B

解析这是一个含蓄虚拟条件句。or相当于or else，otherwise“否则的话”，意思同if they hadn’t enjoyed themselves…，故应选B。

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