.—It's only ten minutes' walk; I could have got there on foot.

问题描述:

.—It's only ten minutes' walk; I could have got there on foot.
— Yes.A taxi _ not at all necessary
Awas B had been C has been D is

选A
It's only ten minutes' walk; I could have got there on foot.
走十分钟就到了,我本可以走去那里的(说明不是走去的)
Yes.A taxi was not at all necessary 没错,根本没必要打的士.(打的士发生在过去了,用过去时)