These mine planets,together with the sun,make up what______(call) our solar system.
问题描述：
These mine planets,together with the sun,make up what______(call) our solar system.
is called 为什么不用 are called
答
最简单的判断方法：
你前面全部不看,把最后一个从句拿出来分析,被动语态还原成主动,变成 we call what our solar system.那么what就跟后面的our solar system是一个结构的同个物体.system是单数,那么换成被动语态 就是what is called our solar system.