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.