Question

【题目】Common sense requires us to get away from the concept that national boundaries are frontiers _________ knowledge may not spread.

A. with which B. across with

C. through which D. from which

Answer 1

【答案】B

【解析】句意：常识需要我们摆脱国界就是边界，而知识不能跨越这一边界进行传播的观念。先行词为frontiers，和从句中动词spread构成结构spread across the frontiers，故选B。