供应链采购的基础是企业之间实现（ ）
A．资金共享
B．信息共享
C．批量采购
D．定期采购
参考答案：B
I have been living in the United States for 20 years, but seldom ________ so lonely as now.
A．have I felt
B．I had felt
C．I have felt
D．had I felt
谈判的基本方式？
