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Answer:
B:made a significant contribution to the civil service examination system.
Explanation:
Empress Wu was the only female emperor in the history of China. She reigned during the Tang Dynasty killed her children in order to become China's Only Female Ruler, she helped to improve the lives of the peasants by lowering taxes, building new public works, improving farming techniques and contribution to the civil service examination system(Chinese imperial examinations).
Answer:
Three-quarters of the states must approve it.
Explanation:
