--Why are you so depressed Lily?- I lost the contest narrowly or I the award of $10

问题补充：

--Why are you so depressed, Lily?

--- I lost the contest narrowly, or I the award of $10,000.

A. had gained

B. would have gained

C. would gain

D. must have gained

答案：

A. had gained

(答案→)B. would have gained

C. would gain

D. must have gained

解析：句意：--莉莉，你为什么那么沮丧？--我差点就赢了比赛了，要不然的话我将赢得10000美元的奖金了。这里是虚拟语气，从lost可以看出是对过去的虚拟，所以应该用would have done，故选B。