In this world our parents are the people who love us most So we must value(珍惜)the days（ ）we spend with them.A that B when C on which
问题描述：
In this world our parents are the people who love us most So we must value(珍惜)
the days（ ）we spend with them.
A that B when C on which
答
C on which
答
A
这里days在定语从句中做spend的宾语，所以选that
答
A
定语从句,先行词是the days,放到后面定语从句中
we spend (the days) with them
是作宾语的,用which/that指代,没有which那就选that