This dictionary, few pages are missing, is of great importance.
A. among which
B. of which
C. in which
D. to which
网友回答
A. among which
(答案→)B. of which
C. in which
D. to which
解析：考查定语从句。先行词为This dictionary，few pages 属于This dictionary，所以用of which，句意：这本字典，它当中的几页不见了，非常重要。所以选B。