— Got your driving license?

— No. I ________ too busy to have enough practice, so I didn't take the driving test last week.[ ]

A. was  

B. am

C. have been  

D. had been

为保证工程项目顺利实施，避免在难以预料的情况下造成投资不足而预先安排的费用是()。

A．流动资金

B．建设期利息

C．预备费

D．其他资产费用