Less than 35 years after the release of Africa honeybees outside Brazil, their descentants, popularly known as killer bees, had migrated as far north as southern Texas.(B) In less that 35 years since releasing Africa honeybees outside Brazil, 原句是正确的,我错选了B。 但是,我觉得B 开头的"In"很有必要啊,A没有这个“in”,反而感觉挺奇怪。尽管B 的relaesing确实比较无厘头。 可以帮我解释一下啊为何可以不要“in”么? 感激!!!