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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
admin
2014-01-17
41
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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专业英语四级
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