According to a review of evidence in a medical journal, runners live three years________(long)than non-runners.
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答案 :longer
巧记:than 是比较级的标志词,如果提示词是形容词,那就八九不离十啦!除了than之外,提示词是形容词又被even, far, much, rather, a little等修饰时,形容词通常用比较级,如:even stronger(strong)等。