作业帮 > 英语 > 作业

One of the requirements for a fire is that the material ___t

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/27 08:36:15
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.