you can keep him at ________length.A.neck's B.foot's C.leg's D.arm's

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youcankeephimat________length.A.neck''sB.foot''sC.leg''sD.arm''syoucankeephimat________length.A.neck''sB.

you can keep him at ________length.A.neck's B.foot's C.leg's D.arm's
you can keep him at ________length.A.neck's B.foot's C.leg's D.arm's

you can keep him at ________length.A.neck's B.foot's C.leg's D.arm's
D arm's length
固定说法,保持一定距离,没听说其他三个
就像中文说画蛇添足,为什么不是添脚、添腿,一个道理

A因为其余三个都有复数形式出现