some of us( )(be)crazy about his songs at that time

some of us( )(be)crazy about his songs at that time

some of us(are )(be)crazy about his songs at that time
some of us这里是一些人,用复数
at that time 过去的某一时间 用were

were
祝你学习愉快！ (*^__^*)
请及时采纳，多谢！

are

were