.--- 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.
网友回答
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。