问题描述：
What would have happen___,as far as the river bank?
5.What would have happened______,as far as the river bank?（2001上海）
A.Bob had walked farther B.if Bob should walk farther
C.had Bob walked farther D.if Bob walked farther
为什么答案选C,希望得到详细解析.
5.What would have happened______,as far as the river bank?（2001上海）
A.Bob had walked farther B.if Bob should walk farther
C.had Bob walked farther D.if Bob walked farther
为什么答案选C,希望得到详细解析.
问题解答：
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