is known to all China will he an and powerful country in 20 or 30 years' time.A. That

问题补充：

is known to all, China will he an and powerful country in 20 or 30 years time.

A. That, advancing

B. This, advancing

C. As, advanced

D. It, advancing

答案：

A. That, advancing

B. This, advancing

(答案→)C. As, advanced

D. It, advancing

解析：As is known to all 这是固定搭配，意为众所周知，是一个非限定性定语从句，而advanced 意为先进的、高级的，结合句意，故选C