One of the requirements for a fire is that the material _________ to its burning
题型：不详难度：来源：
One of the requirements for a fire is that the material _________ to its burning temperature.| A．is heated | B．be heated | C．would be heated | D．shall be heated |
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答案
| B |
解析
试题分析：句意：对火的要求之一是材料要被加热到燃点。主语是requirement，suggestion，order，advice等词后面的表语从句中用虚拟语气：should do，should可以省略，而且material和heat是被动关系，用被动语态，选B。 |
举一反三
__ it to clear up tomorrow, the tourists would climb to the top of the mountain to see the sun __.| A．If; to raise | B．Were; rise | C．Should; rise | D．If; raising |
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