问题
单项选择题
One of the requirements for a fire is that the material () to its burning temperature.
A. is heated
B. will be heated
C. be heated
D. would be heated
答案
参考答案：C
解析：
这里应用动词原形表示虚拟语气。表示建议、命令、意愿和要求的名词如suggestion，advice，order，requirement，request，demand，recommendation，desire等后面接that从句时，从句的谓语要用动词原形或should+动词原形。