—Yes, I have _______ finished it.
A:yet; just
B:yet; ever
C:already; yet
D:already; just
—The land in the southwest of China is in great need of .—Yes, it hasn't rained for a long time there.
秦汉时期和罗马帝国时期是东西方文明的重大发展和成熟时期。这里的“文明发展”和“成熟”的含义分别是( )