Question

【题目】Traffic accidents often happen ________ we can realize. So we must keep the idea of safety in mind to avoid them.

A. after B. before C. until

Answer 1

【答案】B

【解析】句意：交通事故经常在我们意识到之前发生，因此我们脑子里必须保持安全的想法来避免事故。after在…之后；before在…之前；until直到…时候。根据句意So we must keep the idea of safety in mind可知，交通事故的发生往往在我们能意识到之前，故应选B。