语法与词汇 14.While a full understanding of what causes the disease may be several years away, ______leading to a successful treatment could come much sooner.
【正确答案】 B
【答案解析】本题考查名词辨析。a distinction意为“区别，差别；优秀，杰出”。a breakthrough意为“突破，突破性进展”。an identification意为“鉴定，验明；认同”。an interpretation意为“解释，说明；诠释”。根据空格后的a successful treatment可以判断，a breakthrough能使句意完整通顺，故为答案。