来自邵华的问题
【-Mysonisaddictedtothegame"StealingthevegetablesontheQQfarm"．-Whatiscertain，_______，isthatitisbecomingmoreandmorepopularwithlate90s．（）A.althoughB.thoughC.unlessD.whil】
-My son is addicted to the game"Stealing the vegetables on the QQ farm"．
-What is certain，_______，is that it is becoming more and more popular with late 90s．（）
A.although
B.though
C.unless
D.while
