产地检验检疫机构对出境货物检验检疫合格后，通过电子转单将相关信息传到口岸检验检疫机构，并出具______供发货人或代理人到口岸检验检疫机构办理换证手续。

A．出境货物换证凭单
B．预检结果单
C．出境货物换证凭条
D．出境货物通关单

It seems that it is going to rain. You'd better            the windows open when you leave the house. [ ]

A. not leave

B. leave

C. not to leave

D. to leave