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