Every month he sets ___ a sum of money for old age.
问题描述：
Every month he sets ___ a sum of money for old age.
a.apart
b.aside
c.in
d.up
请问选哪个?选和不选的原因?顺便把句子翻译成中文.
答
选B
set aside 固定搭配,留出,分出的意思
翻译：他每个月都留出一些钱来养老.