问题
选择题
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
答案：D
考查虚拟语气。本题是条件状语从句的虚拟语气，从句中用过去完成时表示与过去事实相反，主句用情态动词+have done.故D正确。
