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In 1948-1949, a number of states and cities demanded that ______ take oaths to show their loyalty and committees be set up to examine textbooks for subversive materials.
【正确答案】：teachers
【题目解析】：In 1948-1949, a number of states and cities demanded that teachers take oaths to show their loyalty and committees be set up to examine textbooks for subversive materials.参见教材P217。