what would hane happened ____,as far as the river bank?

问题描述:

what would hane happened ____,as far as the river bank?
A Bob had walked farther
B if Bob should walk farther
C had Bob walked farther
D if Bob walked farther

选C
had Bob walked farther=if Bob had walked farther =
一定要用过去完成时 这里是对过去情况的虚拟语气.had Bob walked farther=if Bob had walked farther