The Qing Dynasty (AD1616-1911) had ten emperors altogether, nine are buried in the two groups of tombs in Hebei Province.
A. of that
B. of whom
C. that
D. which
网友回答
A. of that
(答案→)B. of whom
C. that
D. which
解析：考查定语从句。先行词是emperors，nine 表示皇帝中的九个，用介词of，that不能和介词连用，所以选B。