After people have learned that magnets attract things, centuries passed______the

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问题 After people have learned that magnets attract things, centuries passed______they took note of the fact that magnets sometimes also repel things.

选项 A、before
B、until
C、after
D、since

答案 A

解析直译为：“在他们注意到……这一事实之前已经过了几百年，也就是说，几百年以后才……”全句可译为：“人们早已知道了磁体能吸引别的物体，又过了几百年，才注意到磁体有时也排斥别的物体这一事实。”

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