29).What would have happened ______ ,as far as the riverbank?.if Bob has walked farther B.if Bob should walk fartherC.had Bob walked farther D.should Bob walk farther

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29).What would have happened ______ ,as far as the riverbank?.if Bob has walked farther B.if Bob should walk fartherC.had Bob walked farther D.should Bob walk farther
29).What would have happened ______ ,as far as the riverbank?
.if Bob has walked farther B.if Bob should walk farther
C.had Bob walked farther D.should Bob walk farther

29).What would have happened ______ ,as far as the riverbank?.if Bob has walked farther B.if Bob should walk fartherC.had Bob walked farther D.should Bob walk farther
我觉得选c,题干中为对过去假设的虚拟语气,从句应为sb had done sth,但我不知句意是什麼,只能从语法上判断

我觉得选A,题干中为对过去假设的虚拟语气,但用更通