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 fartherD if Bob walked farther

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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

选C
had Bob walked farther=if Bob had walked farther
一定要用过去完成时 这里是虚拟语气