单选题 Cinger, pepper, cinnamon and some other aromatic flavours might be used for seasoning meat and fish ______ was particularly important when there were no refrigerators.
A. that B. what C. there D. which

【正确答案】 D
【答案解析】[解析] 关系代词用法辨析
本题中为非限定性定语从句，只能用which引导。