It’s not necessary to explain the truth there is spring wind, there is green grass．
A. which wherever
B. that which
C. which when
D. that wherever
网友回答
A. which wherever
B. that which
C. which when
(答案→)D. that wherever
解析：首先that引导同位语从句，解释前面的名词truth，同位语从句中又是一个由wherever引导的让步状语从句。故选D。