People in Yancheng are proud of they have achieved in the past thirty years.A. howB. whic

问题补充：

People in Yancheng are proud of they have achieved in the past thirty years.

A. how

B. which

C. what

D. when

答案：

A. how

B. which

(答案→)C. what

D. when

解析：how如何，怎样；which哪一个；what什么；when什么时候。句意：盐城的人们为他们在过去三十年中取得的成就感到骄傲。结合语境可知下文宾语从句中缺少逻辑宾语，故选C。