问题
选择题
One of the requirements for the fire is that the material ________ to its burning temperature.
A．is heated
B．will be heated
C．would be heater
D．be heated
答案
答案：D
因为requirement后的表语从句的谓语要用“(should +)动词原形”；material(材料)与heat(加热)是被动关系，用被动语态，所以是be heated。