On formal ________,people pay more attention to manners.a、situations b、cases c、conditions d、 occasions
问题描述：
On formal ________,people pay more attention to manners.
a、situations b、cases c、conditions d、 occasions
答
a in+case/occasion
答
d、 occasions
在正式场合，人们更注重礼仪
答
d
on 后面接occasions
其它都是in