单选题For a fire to begin there must be present a combustible material, oxygen or air to （）combustion, and a source of heat at a temperature high enough to start combustion.AbeginBsupportClastDextinguish
单选题
For a fire to begin there must be present a combustible material, oxygen or air to （）combustion, and a source of heat at a temperature high enough to start combustion.
A
begin
B
support
C
last
D
extinguish
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