据考证,世界上最早的牙刷,是用()做成的。
A、猪鬃
B、羊毛
C、棉花
D、柳枝
参考答案:D
I _____ home than it started to rain.
A.had no sooner got
B.would no sooner get
C.got no sooner
D.no sooner got
数据仓库的物理模型