The fire-fighters made every effort to put off the flames. The building burned down completely. 
 
A.The building burned down completely though the fire-fighters made every effort to put off the flames.
B. Had it not been for the fire-fighters’ every effort, the building would have burned down completely. 
C.Making every effort to put off the flames, the fire-fighters completely burned down the building. 
D.Since the fire-fighters made every effort to put off the flames, the building burned down completely.

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