ENERGY-SAVING BULBS SHOULD... TO SAVE ELECTRICITY.A. USE B. USED C...

88. - 400 CAU TRAC NGHIEM GIUP ON TAP TIENG ANH LOP 9
400 CAU TRAC NGHIEM GIUP ON TAP TIENG ANH LOP 9
88. Energy-saving bulbs should... to save electricity.a. use b. used c. be use d. be used