One of the requirements for the fire is that the material ________ to its burning temperature.
A．is heatedB．will be heated
C．would be heaterD．be heated
D
因?yàn)閞equirement后的表語從句的謂語要用“(should +)動詞原形”；material(材料)與heat(加熱)是被動關(guān)系，用被動語態(tài)，所以是be heated。
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