语法与词汇 11.Vigorously challenged yet widely ignored, the theory had languished for half a century, primarily due to its lack of a______mechanism to support the hypothesis.
【正确答案】 A
【答案解析】句意：因受到有力的挑战进而广泛地遭遇冷淡，这个理论萧条了半个世纪，这主要是因为缺乏可信的漂移机制来证明其论点。plausible貌似可信的。credulous轻信的。eligible合格的。creditable可信的。