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--We could have walked to the station.It was so near.--Yes.A

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--We could have walked to the station.It was so near.--Yes.A taxi ____at all is necessary.
A.wasn`t B.hadn`t been C.couldn`t be D.wouldn`t be
A和C搞不清楚.
求解释
选A;前句对过去的虚拟,本来可以走路去的.,其实他们坐了出租车.后句不是虚拟,就是对过去的描述,用过去时,这句话是说没必要计程车,对过去事实的一种述说,用一般过去时.