过去我们校门口有个投币式公用电话.There ___ ___ ___ a pay phone in front of our school
问题描述：
过去我们校门口有个投币式公用电话.There ___ ___ ___ a pay phone in front of our school
答
used to be 曾经有
过去我们校门口有个投币式公用电话.There ___ ___ ___ a pay phone in front of our school
used to be 曾经有