since before ,since ago 语法解析1 请问 在现在完成时态里面 since 5 years before ,since 5 years ago 那个对?还是都正确,讲解下.2 写个句子The air conditioner was turned on 5 hours ago.The air conditioner has been turned on si
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![since before ,since ago 语法解析1 请问 在现在完成时态里面 since 5 years before ,since 5 years ago 那个对?还是都正确,讲解下.2 写个句子The air conditioner was turned on 5 hours ago.The air conditioner has been turned on si](/uploads/image/z/14621142-30-2.jpg?t=since+before+%2Csince+ago+%E8%AF%AD%E6%B3%95%E8%A7%A3%E6%9E%901+%E8%AF%B7%E9%97%AE+%E5%9C%A8%E7%8E%B0%E5%9C%A8%E5%AE%8C%E6%88%90%E6%97%B6%E6%80%81%E9%87%8C%E9%9D%A2+since+5+years+before+%2Csince+5+years+ago+%E9%82%A3%E4%B8%AA%E5%AF%B9%3F%E8%BF%98%E6%98%AF%E9%83%BD%E6%AD%A3%E7%A1%AE%2C%E8%AE%B2%E8%A7%A3%E4%B8%8B.2+%E5%86%99%E4%B8%AA%E5%8F%A5%E5%AD%90The+air+conditioner+was+turned+on+5+hours+ago.The+air+conditioner+has+been+turned+on+si)
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