At the routine office meeting, the headmaster insisted that the problems paid special att

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A. referred to being
(答案→)B. referred to be
C. refer to being
D. refer to be
解析：这题考查过去分词作定语和虚拟语气的用法：referred to是定语修饰the problems，表示“被提到的问题’,又因为insist表示”坚持要求“时，从句用should do，should可以省略。选B。