Question

—_______have you known each other?  —Since we were in our childhood．

A．How far       B．How often

C．How long        D．How soon

Answer

C

【解析】

试题分析：句意：——你们互相认识多长时间了？——自从我们小的时候。how far多远，对距离提问； How often多久一次，对频率提问；How long多长时间，对时间段提问；How soon将要多久，对将要用多长时间提问。根据Since we were in our childhood可知此处指的时间段，故用疑问词how long提问。故选C。

考点：考查疑问词的用法。