2. 外语
  3. One of the requirements for a fire is that the material______to its burning temperature.

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

admin2012-06-19  48
问题 One of the requirements for a fire is that the material______to its burning temperature.
选项 A、be heated
B、is heated
C、would be heated
D、to heated
答案A
解析 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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