THE GAS MUST HAVE BEEN USED UP _____ THE FIRE WENT OF ITSELF. A. B...

Question

16. The gas must have been used up _____ the fire went of itself. A. because     B. as      C. since      D. since

Answer

16. The gas must have been used up _____ the fire went of itself. A. because     B. as      C. since      D. since