They two free tickets to Canada, otherwise they’d never have been able to afford to go. A.

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A. had got
(答案→)B. got
C. have got
D. get
解析：根据所提供的情景“otherwise they’d never have been able to afford to go”可判断出要用一般过去时,表示过去所发生的事或存在的状态。otherwise意为“否则”,其从句的谓语要用虚拟语气。过去完成时表示一个动作或状态在过去某一时间或动作之前已经完成或结束,即“过去的过去”。现在完成时表示已经完成动作或从过去某个时候开始一直延续到现在的动作。