19. It is reported that China has created the first man-made sun in the world recently ?

问题补充：

19. It is reported that China has created the first man-made sun in the world recently, ?

A. isn’t it

B. is it

C. hasn’t it

D. has it

答案：

A. isn’t it

B. is it

(答案→)C. hasn’t it

D. has it

解析：可联系答.案.网客服索取。