问题补充:
We regret to inform you that there are no tickets for Friday’s performance.
A. available
B. useful
C. convenient
D. affordable
答案:
(答案→)A. available
B. useful
C. convenient
D. affordable
解析:A.available可获得的,可买到的,B.useful有用的,C.convenient方便的, D.affordable 可负担得起的,句意:我们很遗憾的通知你星期五表演的票买不到了。所以选A。