we are talking about the piano and pianist_were in the concert we attended last night

资源ID：

we are talking about the piano and pianist_were in the concert we attended last night Awhich Bwhom Cwho Dthat

我们正在谈论昨晚音乐会上的钢琴和钢琴师

that

当先行词既有人又有物时，关系代词只用that