China’s success in manned-space-craft travel shows out country has become one of the grea

问题补充：

China’s success in manned-space-craft travel shows out country has become one of the greatest powers in space research.

A. what

B. which

C. 不填

D. it that

答案：

A. what

B. which

(答案→)C. 不填

D. it that

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