单项选择题
A.cooperate B.cooperating C.cooperation D.cooperated
A.开证行;开户银行;议付银行 B.议付银行;开证行;开户银行 C.开证行;议付银行;开户银行 D.开户银行;开证行;议付银行
A.customs clearance;customs broker B.customs broker;customs clearance C.customs broker;customs entry D.customs entry;customs clearance