DAVID USED TO SMOKE 20 CIGARETTES A DAY. A. DAVID OFTEN SMOKES 20...

56. David used to smoke 20 cigarettes a day.

A. David often smokes 20 cigarettes a day.

B. David didn't use to smoke 20 cigarettes a day.

C. David often smoked 20 cigarettes a day.

D. David is used to smoking 20 cigarettes a day.