27．$Teachers have to constantly update their knowledge in order to maintain their professional ___.$
Answer key
C
Teachers have to constantly u…——2011 高考英语第 26 题答案解析
2011_江苏卷 (英语)
完整解析 · 逐步详解
【答案】C
✅ 来源：2011年 · 江苏 · 2011_江苏卷 (英语) · 第 26 题 · 本题已通过全部自动发布校验
After reading this explanation, can you solve it on your own now?
题目指纹
这道题真正考什么？
difficulty
Differentiating