选C
until：直到.
句意为：本经常打电脑游戏直到半夜You ___ a new car I think.A.don't need to buy B. need not to buy C. not need buy D.don't need buy选Aneed可以作使役动词也可以作情态动词。前者是need to do sth.后者是need do sth.注意这时候need前就不能加助动词了