将人生价值的实现总结为诚实、勤奋和专业三要素的人是（）。
A、卡耐基
B、乔吉拉德
C、安东尼•罗滨
D、保罗•盖蒂
参考答案：A
The calculations, had they been done by hand, ______all practical value by the time they were finished.
A．had lost
B．would lose
C．should have lost
D．would have lost
机动车维修档案保存期为（）年。
A.1
B.2
C.3
D.4
