___ medicine works in a human ……___ medicine works in a human body is a question___not everyone can understand fully.a.how,whatb.that whichc.that whatd.what that
问题描述：
___ medicine works in a human ……
___ medicine works in a human body is a question___not everyone can understand fully.
a.how,what
b.that which
c.that what
d.what that
答