Members of a free trade area removes barriers to the flow of goods and services among themselves while each member still ______ its own policy as regards to trade with outsiders.
A、adopted
B、adopts
C、abandons
D、abandon
【正确答案】：B
【题目解析】：Members of a free trade area removes barriers to the flow of goods and services among themselves while each member still adopts its own policy as regards to trade with outsiders.参见教材P35。