He must not allow this unusual barrier to stop him from fighting against the enemy.
【正确答案】 B
【答案解析】解析:题干:他不允许一些不寻常的障碍阻挠他与敌人的战斗。barrier障碍,隔阂。interior内部的;obstacle障碍物;interruption打断,中断;interference干涉,介入。故答案为B。