问题
选择题
_______ is known to the world, the Chinese in many places _______ the old traditions.
A．That; keep on
B．which; keep out
C．It ; keep back
D．As; keep up
答案
答案：D
考察定语从句和固定词组。As指代后面一句话的内容，在句中作主语。Keep up保持。结合句意可知D正确。句意：众所周知，很多地方的中国人都保持着很多古老的风俗。