— What’s made you so upset?— three tickets to the pop music concert.A. LosingB. LostC. B

问题补充：

— What’s made you so upset?

— three tickets to the pop music concert.

A. Losing

B. Lost

C. Because of losing

D. Since I lost

答案：

(答案→)A. Losing

B. Lost

C. Because of losing

D. Since I lost

解析：这题考查动名词，句意是：--什么使你这么难过？--丢了三张流行音乐会的票。说明回答的是主语的内容。用动名词做主语。