I hurt my_____(膝盖),and it's painful when i walk 用I hurt my_____(膝盖),and it's painful when i walk用复数还是单数?为什么

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I hurt my_____(膝盖),and it's painful when i walk 用I hurt my_____(膝盖),and it's painful when i walk用复数还是单数?为什么
x)T(-*Qȭ{:^}>{=:y) % yi9 y 9 ϧ S+P%ϦnxƳNdwÓ6IE`ܧ_`g3X "h_\gu tG ˀɎ%OvX -(|V 6yH1t)?

I hurt my_____(膝盖),and it's painful when i walk 用I hurt my_____(膝盖),and it's painful when i walk用复数还是单数?为什么
I hurt my_____(膝盖),and it's painful when i walk 用
I hurt my_____(膝盖),and it's painful when i walk
用复数还是单数?为什么

I hurt my_____(膝盖),and it's painful when i walk 用I hurt my_____(膝盖),and it's painful when i walk用复数还是单数?为什么
单数

复数吧……两个膝盖……

复数,因为膝盖是双的

knee