It is on October 1,2009 that the People's * ____ its 60th birthday.

问题描述:

It is on October 1,2009 that the People's * ____ its 60th birthday.
  A.congratulated B.kept C.remained D.celebrated
选哪一个?尤其
是讲讲A跟D的区别?

选D.
celebrate
庆祝:用荣誉、节日或欢乐的庆典庆祝(一天或一个事件)
congratuate
祝贺:对于(别人的)成绩或好运表示高兴或肯定