They __________ where to build the new hospital before the work began.

题目

They __________ where to build the new hospital before the work began.
a,have been decide B ,had decided c,had been decide D ,will be decided 为什么选b?

答案

had done...过去的过去,过去完成时.
before你看到了吗,before the work began...这里的began已经是过去式了.
那么在动工之前发生的动作是不是要用过去完成时呢?
before引导时间状语从句,从句用过去式,主句用过去完成时.