. The ancient Chinese vases display attracted lots of experts and collectors, some of whom suggested they on the next fair.
A. on; displayed
B. on; be displayed
C. in; displayed
D. in; be displayed
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解析：考查固定结构。on display在展览，展出；suggest当建议讲，后面宾从they on the next fair.的谓语动词用(should)+do的虚拟语气，且主语they（花瓶）和display是动宾关系，所以用被动语态。选B。