【题目】They got two free tickets to Canada; otherwise, they’d never have been able to ______ to go there.
A. admit B. avoid
C. appreciate D. afford
在线课程【答案】D
【解析】
试题分析：A. admit承认，容许；B. avoid避免；C. appreciate欣赏，感激；D. afford买得起。句意：他们得到了两张去加拿大的免费票，否则他们永远买不起。根据句意选D.