单选题:Oneoftherequirementsforafireisthatthematerial______toitsburn 题目分类:英语 题目类型:单选题 查看权限:VIP 题目内容: Oneoftherequirementsforafireisthatthematerial______toitsburningtemperature.A.wereheatedB.mustbeheatedC.isheatedD.beheated 参考答案: 答案解析: