Question

【题目】The professor made a great contribution to improving his students' listening and speaking ________ (skill)．

Answer 1

【答案】skills

【解析】

句意为：这位教授对他的学生的听力和口语________的提高做了很大的贡献。根据语境可知此处指听力和口语技巧，应用名词的复数，故填skills。