今日练习题为语法题，题目如下
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
正确答案：
D
选项分析：
A 结构笨拙，reduce后没有直接跟宾语;require sth of doing不符合习惯
B being多余;down和reduce语义重复;逗号多余;up多余
C being多余;不合理的省略了from
D 正确，reduce 宾语 from...to
E 结构笨拙，reduce后没有直接跟宾语;required for the assembling 太啰嗦;逗号多余
