2. 职称英语
  3. After people have learned that magnets attract things, centuries passed______the

After people have learned that magnets attract things, centuries passed______the

游客2025-03-18  20
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 cen—turies passed they took note of the fact…；如果用until，应该是they didn’t take note ofthe fact that．．．until centuries passed。
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