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After people have learned that magnets attract things, centuries passed______they took note of the fact that magnets sometimes a
After people have learned that magnets attract things, centuries passed______they took note of the fact that magnets sometimes a
admin
2016-02-04
72
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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