摘要: 表示在某一时间点或事件以前时.只能用before.不用ago.因为这种用法是将before当作介词或连词使用.ago不具有这种功能.例如: ① He will come back before eleven o'clock. ② Where did your brother study before he joined the army? ③ It was hoped that this would be achieved before the year 2006.

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