下列描述哪一种是正确的?
B
暂无解析
设f(0)=0,则f(x)在x=0处可导の充要条件为（）
________theconcerthadbegundidwerealizewhatasplendidshowitwasgoingtobe.
Onlya(n)________fewwereinvitedtothedancingparty.
Night________(fall),wehurriedhome.
Theboyranoutoftheclassroomwithouttheteacher's_______.
