One of the requirements for a fire is that the material ____to its burning temperature.

A、beheated
B、isheated
C、wouldbeheated
D、toheated
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正确答案:

A

答案解析:

【句意】形成火的条件之一是该材料能够被加热到燃烧的温度。

【难点】A)项requirement这个词和idea,suggestion等一样,要求从句里的谓语动词用(should)+动词原形。

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