They ( )all the detail of the plan time and again to make su

答案是B
翻译：他们一次又一次地修改计划来确保项目成功进行.
再问： 那这些词组都是什么意思啊？
再答： dipped A into B---把A放到B里 get you through to Mr Wang ------让王先生接你的电话 B went through a plan----反复检查计划 Cgot over a difficulty----克服困难