供应链的形成、存在、重构，都是基于一定的市场需求而发生的，并且在供应链的运作过程中，（）是供应链中信息流、产品／服务流、资金流运作的驱动源。

A.市场需求拉动

B.企业竞争拉动

C.用户需求拉动

D.生产需求拉动

They_________ our luggage at the customs and made a mess of it.  [ ]

A. turned out                        

B. went through

C. looked into                        

D. took away