单选题 One of the requirements for a fire is that the material______to its burning temperature.
【正确答案】 C
【答案解析】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。