We tried  _____ to persuade him to stay home, but at last, he went to the construct site in spite of his illness.[ ]

A. in vain

B. in return.

C. in fact

D. in time

预算单位零余额账户日终余额必须为零。中央授权支付业务发生退款的，经办行应及时在（）通过重客系统，将资金从零余额账户退回总行。

A、当日或下一工作日

B、三个工作日内

C、十个工作日内

D、月末前