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

After people have learned that magnets attract things, centuries passed ______ t

游客2023-11-08  68
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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