GAS IS ______ COAL.A. MORE CHEAP THAN B. MORE CHEAPER AS C. MUCH C...

24. - 33 DE TRAC NGHIEM CUA MAI LAN HUONG
33 DE TRAC NGHIEM CUA MAI LAN HUONG

24. Gas is ______ coal.

a. more cheap than b. more cheaper as c. much cheaper than d. so cheaper than