The boy         the first prize, but he was so careless as to make a foolish mistake.
A．must have gainedB．need have gained
C．could have gainedD．shall have gained
C
考查情態(tài)動(dòng)詞。must have done 對(duì)過去事情肯定的推測，一定，need have done 本需要做某事，而實(shí)際上沒有做，could have done 本可以做某事，而實(shí)際上沒有做，句意：這個(gè)男孩本可以獲得第一名的，但是實(shí)際上沒有做。故選C。
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