单选题HenryFord’sintroductionoftheproduct

问题补充：

单选题Henry Ford’s introduction of the production line greatly reduced the time it took ________．A.to make a carB.for buying a carC.designing a carD.for a car to repair

答案：

A解析It takes time to do sth．表示“做某事花费时间”，该句中time后接定语从句，引导词that/which作took的宾语，已省略。