for some time now, Chinese people .under the leadership of CPC,___英语解答

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 improvingC were improvingD improved
the answer is B,翻译下和解释

人气：420 ℃　时间：2019-10-17 02:45:20

解答

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...