In a time of social reform, people’s state of mind tends to keep ___

In a time of social reform, people’s state of mind tends to keep ___ with the rapid changes of society.
A、step B、 pace C、 touch D、 progress
为什么选B？？？请翻译整句 谢谢

Til the end of time In a world so close to me in time of是什么意思？ We lived in Beijing for a period of time. in of time和out of timen When the time (1)____ ,a man puts a plate of the new dog food in front of We are now in great need of help. So your support will certainly make a Tom was in t ,so his uncle gave hi a lot of money. ____ there a number of fish in the river at that time? ____ for a long time, most of the crops in this area died from lacking water A GREAT DEAL OF TIME....