题目

题型：不详难度：来源：

What would have happened ________，as far as up to the river bank.

A．Bob had walked farther

B．if Bob should walk farther

C．had Bob walked farther

D．if Bob walked farther

答案

C

解析

因为主句的谓语动词用了would have happened，所以从句的谓语动词要用过去完成时。在虚拟语气中，如果条件状语从句中的if省略，该句要倒装。