---We could have walked to the station.It was so near .--Yes a taxi at all necessary .

问题补充：

---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

答案：

(答案→)A. wasn’t

B. hadn’t been

C. wouldn’t be

D. won’t be

解析：Wasn’t 这里表示一种事实。