这是个特殊疑问句
结构是：特殊疑问词 + 一般疑问句,现在完成时的一般疑问句是：助动词have/ has + 主语 + 过去分词.所以用：How long has it been?
现在完成时的特殊疑问句例句：How long have you been at this school?你来这所学校多久了?
how long has it been since I have seen one!是感叹句吗
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