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.

admin2013-10-11  40
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
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