作业帮One of the requirements for a fire is that the material ___to its burning temperature .A.were heated B.must be heated C.is heated D.be heated 选择哪个?理由?
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One of the requirements for a fire is that the material ___to its burning temperature .A.were heated B.must be heated C.is heated D.be heated 选择哪个?理由?
One of the requirements for a fire is that the material ___to its burning temperature .
A.were heated B.must be heated C.is heated D.be heated
选择哪个?理由?
One of the requirements for a fire is that the material ___to its burning temperature .A.were heated B.must be heated C.is heated D.be heated 选择哪个?理由?
D
require that +（should） do：要求……,其中should可以省略.
再加上被动语态,所以应该是be heated.
这句话的意思是：燃烧的一个要求是物质应该达到其着火点.
B.
材料必须加热到燃点.
要求性条件就要用必须.
B that后面引导的是宾语从句，在这个从句中the material与heat的关系是被动关系，所以用被动语态。根据句意应选B。着火的一个条件是燃烧物到达着火点。
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