jacky
问题补充说明："We could have walked to the station,it was so near""Yes,A taxi( )at all necessary."A.wasn't B.hadn't been C.wouldn't be D.won't be
1,
正确选项是A.wasn't。来自Wecouldhavewalked...这是用了虚拟语态，表示对过职写机序操压去事实的虚拟(说话人“过去”事实上没步行去车站搞第优个，而是乘坐taxi，现在有点后悔，因为车站很近)。所以答话人用的也是虚拟语态，对现在事实的虚拟，用过去式360问答wasn't(他们坐了taxi，用虚拟语态说“坐taxi是完全没必要的”)。
如果是D,那题目谓使额阻绿策套易应是:
Wecouldhavetowalktothestation;itwassonear.-Yes.Ataxi______ata回存余llnecessary.
是一般现在时态.
2,
