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