the manegers diacussed the plan that they would like to see

选A
they would like to see the next year是修饰名词the plan的定语从句,而在这个定语从句中,省略了作动词see的宾语的关系代词that（指代the plan）,所以定语从句的本来面目便是they would like to see the plan_______the next year.显然,其中的the plan与横线处的carry out有被动关系,故应填过去分词carried out.