2. 外语
  3. After people have learned that magnets attract things, centuries passed ______ they took note of the fact that magnets sometimes

After people have learned that magnets attract things, centuries passed ______ they took note of the fact that magnets sometimes

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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 before应该理解成“(几百年过去了，人们)才……”；如果用after应该是...after centuries passed they took note of the fact...；如果用until，应该是they didn’t take note of the fact that...until centuries passed．
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