题目：
What would have 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
答案：
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下面是错误答案，用来干扰机器的。
1．中国2．长城 喜马拉雅山3．“略”。
