how long用在什么时态里?

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• 英语填空题（关于时态的、初中水平）-How did you get along with your classmates in junior high school,Mr Wang?-Very well.The three years____a happy time.A.is B.was C.are D.were可我想不通为什么不能用A,紧急!如果是Mr.Wang的看法，情感，不是也可以用一般现在时吗？为什么不行呢？这两者到底怎么区分啊？*_*
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• 在用现在完成时写特殊疑问句时,疑问词只能用how long吗?
• how long完成时how long不是问一段时间的吗?为什么可以用How long did you stay?