Many experts stick to the view teacher development is the key to the education quality. A

问题补充：

Many experts stick to the view teacher development is the key to the education quality.

A. which

B. what

C. that

D. where

答案：

A. which

B. what

(答案→)C. that

D. where

解析：考查名词性从句。that引导的同位语从句，是对view的内容的解释。句意为：很多专家坚持这个观点：教师的发展是教育质量的关键。