.I was lucky the win a gold medal in the800-metre race.You through hard training.

问题补充：

.--- I was lucky the win a gold medal in the800-metre race.

--- You through hard training.

A. must go

B. should go

C. must have gone

D. should have gone.

答案：

A. must go

B. should go

(答案→)C. must have gone

D. should have gone.

解析：考查情态动词。句意：我很幸运在800米长跑中赢得一块金牌。——你一定经过了艰苦训练。可知下文是对过去已经发生的事情做肯定的推断，故用情态动词加完成时态，should have表示过去应作而没做的事情，故选C。