...million , billion 和dozen什么时候用复数,什么时候用单数?_百度...答:■而当后面接of 短语时, dozen , hundred , thousand , million 等在标准英语中大都采用复数形式。例句:1 .“ Have you ever gone water-skiing before ? ”“ Oh , yes, dozens of times.”“ 你以前滑过水吗?” “ 噢, 滑过, 滑过几十次了。”2 . Hundreds of tree species face ...