After the earthquake the electricity supply failed, _____ the cooling system break down.[ ]

A. having made

B. making

C. made

D. to make

下列关于本票与汇票的区别，说法正确的是( )。

A．本票是书面支付承诺；汇票是书面支付命令

B．本票都是即期的；汇票有即期、远期之分

C．本票的票面有两个当事人；汇票的票面有三个当事人

D．远期本票无须办理承兑；远期汇票则要办理承兑