-- Would you like to come to the dinner party here on Saturday ?

　 ---Thank you. I'd love to, _____ I'll have to finish all my homework before the weeked, otherwise, my parents won't let me go.]

A．because 　　　

B．and 　　　　

C．so 　　　　

D．but

托收是出口人在货物装运后，开具以进口方为付款人的汇票，委托出口地银行通过它在进口地的分行或代理行代出口人收取货款一种结算方式，属于银行信用。