38. (2018来宾)It is necessary for us students ________ the listening ability.
A. to improve  B. improving  C. improve  D. improves
38. A【解析】考查动词不定式。句意：对于我们学生来说提高听力技巧是有必要的。此处考查固定句型It's ＋adj.＋for sb. to do sth.，对于某人来说做某事是……的。故选A。