a nest is to a bird __a house it to a man. A,where B, how C, what D,when 为什么要选D

题目

a nest is to a bird __a house it to a man. A,where B, how C, what D,when 为什么要选D

答案

意思是
鸟巢对于鸟来说就好像房子对于人.
但楼上两位都填错了,应该是what
a nest is to a bird what a house is to a man
同类例句
Honey is to a bee what milk is to a cow