答案A
先说问句,两句话,中间一空,前面是一般现在时,后面是一般过去时,再看前一句中的how long is it 便知,这个属于 It is + 时间段+ since从句（一般过去时）
第二空how far 从语境看,指的是“学们纳闷能和老师交往有多深” 表程度,而非距离.
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the answer is a,WHY IN details
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