问题补充:
---What’s made Ruth so upset?
--- three tickets to the folk music concert.
A. Lost
B. Losing
C. Because of losing
D. Since she lost
答案:
A. Lost
(答案→)B. Losing
C. Because of losing
D. Since she lost
解析:根据问句:什么使如斯如此伤心呢?可推断出示对主语进行提问,从四个选项中可以看出B. Losing可做主语,其余三项不能,所以选B。