We would have called a taxi yesterday if Harold us a ride home.A. didn’t offer B. wouldn’

问题补充：

We would have called a taxi yesterday if Harold us a ride home.

A. didn’t offer

B. wouldn’t offer

C. hasn’t offered

D. hadn’t offered

答案：

A. didn’t offer

B. wouldn’t offer

C. hasn’t offered

(答案→)D. hadn’t offered

解析：句意：如果哈罗德昨天没有送我们回家的话，我们将叫一个出租车。从主句的谓语动词would have called可以看出这是对过去的虚拟，那么从句应该用had+done，故选D。