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

因為主句的謂語動詞用了would have happened，所以從句的謂語動詞要用過去完成時。在虛擬語氣中，如果條件狀語從句中的if省略，該句要倒裝。
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