高等继续教育 / 电子商务英语
正确率：100%
题型描述: 单选题
One of the requirements for a fire is that the material ＿＿＿＿＿＿＿to its burning temperature.
A.is heated
B.has been heated
C.will be. heated
D.be heated
One of the requirements for a fire is that the material ＿＿＿＿＿＿＿to its burning temperature.
A.is heated
B.has been heated
C.will be. heated
D.be heated
参考答案：