途中作业的概念？
参考答案：
货物在途中的作业主要包括货物的交接检查、货物的换装整理、货物运输合同的变更和解除及运输阻碍的处理等
He is a financial manager in Wall Street now, but nobody knows he _____ part-time jobs here and there for survival for eight years.
A．does
B．did
C．had done
D．has done
双边贸易条约
