After years’ study with the help of Professor Henry Higgins, Eliza was able to various levels of English usages, such as standard and substandard.
A. indicate
B. differ
C. distinguish
D. mark
网友回答
A. indicate
B. differ
(答案→)C. distinguish
D. mark
解析：句意：经过多年的研究在亨利希金斯教授的帮助下,伊丽莎能够区分英语用法的各种水平，例如标准的和不合格的。Indicate表明； differ不同； distinguish区分；mark标志。根据句意故选C。