We are living in an age we treasure very much, because it sees man’s rapid development.
A. which
B. when
C. where
D. what
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(答案→)A. which
B. when
C. where
D. what
解析：考查定语从句，先行词是an age，定语从句中treasure缺少宾语，所以选which，句意是：我们生活在我们非常珍惜的时代，因为它见证了人类的迅速发展。选A。