They got two free tickets to Canada, otherwise they able to afford to go.
A. wouldn’t have been
B. mustn’t have been
C. wouldn’t be
D. hadn’t been
网友回答
(答案→)A. wouldn’t have been
B. mustn’t have been
C. wouldn’t be
D. hadn’t been
解析： 句意：他们得到了两张去加拿大的免费票，否则他们是绝对出不起旅费的。否则；要不然，后面用would have done表示与过去事实相反的虚拟语气，本句相当于：If they hadn’t got two free tickets to Canada, they would, they wouldn’t have been to afford to go.