He worked very hard, otherwise he______(不可能通过)the entrance examination.couldn’t

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问题 He worked very hard, otherwise he______(不可能通过)the entrance examination.

选项

答案 couldn’t have passed

解析本句为混合型虚拟语气。otherwise是虚拟语气的含蓄性暗示。本句主句为真实情况，otherwise后面为与过去事实相反的情况，用过去完成时。

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