请教英语关于主从句时态的问题?这句:It remains a question when the new classroom building has been completed.这个主句 it remains 是一般现代时吧,when 后为什么要用 现在完成时,在没有时间状语的情况下,怎
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![请教英语关于主从句时态的问题?这句:It remains a question when the new classroom building has been completed.这个主句 it remains 是一般现代时吧,when 后为什么要用 现在完成时,在没有时间状语的情况下,怎](/uploads/image/z/7275200-32-0.jpg?t=%E8%AF%B7%E6%95%99%E8%8B%B1%E8%AF%AD%E5%85%B3%E4%BA%8E%E4%B8%BB%E4%BB%8E%E5%8F%A5%E6%97%B6%E6%80%81%E7%9A%84%E9%97%AE%E9%A2%98%3F%E8%BF%99%E5%8F%A5%EF%BC%9AIt+remains+a+question+when+the+new+classroom+building+has+been+completed.%E8%BF%99%E4%B8%AA%E4%B8%BB%E5%8F%A5+it+remains+%E6%98%AF%E4%B8%80%E8%88%AC%E7%8E%B0%E4%BB%A3%E6%97%B6%E5%90%A7%2Cwhen+%E5%90%8E%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E7%94%A8+%E7%8E%B0%E5%9C%A8%E5%AE%8C%E6%88%90%E6%97%B6%2C%E5%9C%A8%E6%B2%A1%E6%9C%89%E6%97%B6%E9%97%B4%E7%8A%B6%E8%AF%AD%E7%9A%84%E6%83%85%E5%86%B5%E4%B8%8B%2C%E6%80%8E)
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