选择题：What aids there were to lighten labor were immemor

What aids there were to lighten labor were immemorial, like the mill, which was already ancient in Chaucer’s time. A 像磨房一样的一些旨在减轻劳动强度的古代机械，在乔叟时代就已经是古董了。
B 一些旨在减轻劳动强度的机器不知从何时代起就有了，比如磨房，在乔叟时代就已经是古董了。
C 一些旨在减轻劳动强度的古代机械，比如磨房，在乔叟时代就已经是古董了。
D 像磨房一样的一些在乔叟时代就已经用了很久的机器，旨在减轻劳动强度，不知从何时代起就有了。