44. The automotive conveyor-belt system, which Henry Ford modeled after an assembly-line technique introduced by Ransom Olds, reduced from a day and a half to 93 minutes the required time of assembling a Model T. (A) from a day and a half to 93 minutes the required time of assembling a Model T (B) the time being required to assemble a Model T, from a day and a half down to 93 minutes (C) the time being required to assemble a Model T, a day and a half to 93 minutes (D) the time required to assemble a Model T from a day and a half to 93 minutes (E) from a day and a half to 93 minutes, the time required for the assembling of a Model T 选D?
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