Parentslovetheirchildrenwithadevotion______noreturn.
15.Parentslovetheirchildrenwithadevotion_______noreturn.
A.whichtheyaskforB.whichtheyask
C.forwhichtheyaskforD.forwhichtheyask
为什么选C,不是D.
那里面两个for分别是什么作用啊