英语完形填空的一部分题over the years,studies have shown that watchinga

英语完形填空的一部分题
over the years,studies have shown that watchinga lot of TV leads to poor eating habits,too little exercise,and violence.Frank Vespe of the TV-Turnoff Network said that turning off the TV "is or ___,part of a healthy lifestyle"
A will be B keeps away C may be D could be