A:to buy
B:which to buy
C:for him to buy
D:with which to buy
历史事件的发生往往是多种因素综合作用的结果。解放战争最终取得胜利的因素有( )
①精良的武器装备 ②***的正确领导
③丰富的物资供应 ④人民群众的大力支持
造成挫折的原因有很多,不属于人为原因的是( )
I want to buy _________ piano for my daughter as the birthday gift. She's good at playing ________ piano. What do you think of _________ black one?