问到英语语法问题.12.Physicsisthepresent-dayequivalentofusedtobecallednaturalphilosophy,fromwhichmostofpresent-daysciencesarose.(选D,为什么不是选C)A.thatB.allC.whichD.what

Question

问到英语语法问题.
12.Physics is the present-day equivalent of _____ used to be called natural philosophy,from which most of present-day sciences arose.
(选D,为什么不是选C)
A.that B.all C.which D.what

Answer 1

……= =
这个句子缺少主语.
（
XXX） used to be called natural philosophy.用What代替.