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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

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。

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