---You could have walked here.
---Yes. A taxi ___________ necessary.
A．isB．wasC．isn’tD．wasn’t
D
考查時態(tài).根據(jù)上文,你應(yīng)該不行來這兒.是的,出租車不是必須的.可知下文敘述的是過去該做的動作,故選D.
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