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?

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They__________wheretobuildthenewhospitalbeforetheworkbegan.a,havebeendecideB,haddecidedc,hadbeendeci

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?
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?

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?
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.

因为决定是在开始之前发生的 且对后者造成了影响

选B 用 过去完成时 因为 注意 句尾的 BEGAN 用的是过去式 工作开始就是过去时,had decided the hospital 是过去的过去 所以是故去完成时。
不知道这样解释 你能否明白
欢迎追问

B

除了B 其他的都是被动格式,而此题主体they做出decide这个动作是主动 不是被动。“在。。。之前 before the work began----在一个过去的动作之前已经完成的decide这个动作,所以用过去完成时。