A:whoever
B:whomever
C:anyone
D:who
— There is an art festival in our school on Saturday.
— Oh, great! We'll _________ then.
近年来,微创业模式悄然兴起——一个或几个人牵头,聚集众人的微小力量,有钱出钱,有力出力,最终实现大家的梦想。微创业模式的兴起说明( )
已知数列1,11+2,11+2+3,⋯11+2+3+⋯+n,⋯,则其前n项的和等于____