小明的父亲是公司老板，经常在外跑业务，住宿、消费、给人家买东西等经常要随时付款，对于他来说，最方便可靠的付款方式是

A．随身带大量现金

B．开给对方支票

C．使用信用卡

D．通过银行划款

Without the timely aid from different provinces, the affected people in those areas ________ the difficulty.

A．wouldn’t overcome

B．mustn’t have overcome

C．hadn’t overcome

D．wouldn’t have overcome