This is the man_.A.I referred to B.who I referred to C.whom I referred to D

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Thisistheman_.A.IreferredtoB.whoIreferredtoC.whomIreferredtoDThisistheman_.A.IreferredtoB.whoIreferr

This is the man_.A.I referred to B.who I referred to C.whom I referred to D
This is the man_.A.I referred to B.who I referred to C.whom I referred to D

This is the man_.A.I referred to B.who I referred to C.whom I referred to D
A

D 以上都正确

B吧，定语从句，MAN做主语