He is different from _______he used to be.A.whatB.whichC.whom选择哪个?

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He is different from _______he used to be.
A.what
B.which
C.whom
选择哪个?

A 后面的句子少了成份,

A.
what在宾语从句中,有代替名词的作用,在句中可作表语