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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、do heat

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

A. is heated                                               B. will be heated

C. be heated                                              D. would be heated

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

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

   A. is heated                B. will be heated               C. be heated   D. would be heated                                  

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

A. is heated　 B. will be heated　 C. be heated　 D. could be heated