Having been trapped in the coal mine for seven days,the miners      at last．[ ]

A．are rescued    

B．were rescued    

C．would be rescued    

D．had been rescued

大账户缴费入账与普通缴费入账的区别是（）上。

A.异步、同步

B.同步、异步

C.异步、异步

D.同步、同步