For some time now Chinese people under the leadership of CPC the contents of the Scien

问题补充：

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

答案：

A. had been improving

(答案→)B. have been improving

C. were improving

D. improved

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