i was left with several curiously shaped bits of metal which

留给我几块形状奇葩的金属,它们貌似放哪都不合适.
leave with 你可以当做是短语,理解成留给某人某物.
其实是be left是被留下的意思,with后面是伴随的状语.
被动语态就是表示被动,不是我主动剩下的,是别人留给我的,所以是i was left with.
which did not seem to fit anywhere
是which引导的定语从句修饰前面的metal.seem to do 是固定搭配,意思是好像.
did not seem to fit anywhere 就是看起来好像哪都安不上.