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They __________ two free tickets to Canada, otherwise they’d never have been able to afford to go.
A．had gotB．got
C．have gotD．get
B

B。句子前半句講的是過(guò)去的事實(shí)，用一般過(guò)去時(shí); 后半句講的是對(duì)過(guò)去情況的假設(shè)，故用了would never have been這樣的形式
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