填空题 The salesman told me that a good pair of glasses were supposed to last at least 3 to 4 years.
【正确答案】
【答案解析】were应改为was。[解析] 句意：销售人员告诉我一副好眼镜应至少能撑三至四年。a good pair of glasses做主语时，谓语动词要用单数。