One of the requirements for a fire is that the material _________ to its burning temperature.
A．is heatedB．be heatedC．would be heatedD．shall be heated
B

試題分析：句意：對火的要求之一是材料要被加熱到燃點。主語是requirement，suggestion，order，advice等詞后面的表語從句中用虛擬語氣：should do，should可以省略，而且material和heat是被動關(guān)系，用被動語態(tài)，選B。
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