SINCE THE 1970S, COMPUTERS ______ AT A LOW ENOUGH COST TO ALLOW IN...

32. - ON TAP KIEM TRA 45 LAN 2 ANH 10
ON TAP KIEM TRA 45 LAN 2 ANH 10

32. Since the 1970s, computers ______ at a low enough cost to allow individuals to own a personal computer.

A. are produced B. will be produced C. were produced D. have been produced