语法与词汇 40.The company's training plan was designed to help the employees to improve their work habits and______.
【正确答案】 D
【答案解析】本题空格处是说改进他们的工作习惯和效率。efficiency的意思是“效率”；proficiency的意思是“精通，熟练”；sufficiency的意思是“足够”；insufficiency的意思是“不足”。四个选项中只有D项符合题意。