One of the requirements for a fire is that the material______to its burning temp

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问题 One of the requirements for a fire is that the material______to its burning temperature.

选项 A、heated
B、be heated
C、to be heated
D、being heated

答案 B

解析本题测试虚拟语气。名词requirement的同位语从句或表语从句的谓语需用虚拟语气should+动词原形，should可省略。

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