For 50 years they were able to produce and sell their goods more cheaply than other countries and this gave them a______advantage in world trade.

【正确答案】 A

【答案解析】各项的意思是：considerable相当大(或多)的；concrete实体的，确定的；considerate体贴的；体谅的；conventional依照惯例的，常规的。根据句意判断，答案是A。