During mAny sECtors ArE FounDEring, thE $21 Billion viDEogAmE soFtwArE inDustry is Booming, ADDing gAmE DEvElopErs At A rAtE oF 2,500 A yEAr in thE unitED stAtEs AlonE.
A．whEn
B．whErE
C．woulD
D．whilE