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By using both ears one can tell the direction __ a sound com

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By using both ears one can tell the direction __ a sound comes.
A.in which B.from which C.when D.to which 我觉得 come from 很对啊 为什么要选A呢 in direction 不是去的方向么
By using both ears one can tell the direction __ a sound com
你先把后面那部分转换成一个完整句子:A sound comes from the direction.
那么,此时,你就会明白了.
blank部分就要填where(关系副词when,where,why的含义相当于"介词+ which"结构,因此常常和"介词+ which"结构交替使用)
而正如1楼讲的,in direction是固定词组,所以必须用in + which.