for some time now, Chinese people .under the leadership of CPC,____the contents of the scientific de

题目

for some time now, Chinese people .under the leadership of CPC,____the contents of the scientific development theory in the course of practicing socialism in China.
A had been improving B have been improving C were improving D improved
the answer is B,翻译下和解释

答案

For some time now, Chinese people, under the leadership of CPC,____the contents of the scientific development theory in the course of practicing socialism in China.A had been improving B have been i...