Question

Our teachers are very friendly to us.  We _____  friends since three years ago.
A. have been       B. have become     C. would be

Answer 1

A

试题分析：句意：我们的老师对我们非常友好，我们三年前就成为好朋友了。根据句中时间状语since three years ago（自从三年前，表时间段）可知此空应用现在完成时态，和时间段连用要用延续动作动词，故选A。