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题目内容
（兰州财经大学大学英语）
(2分)What would have happened ______ as far as the river bank?
A. if Bob has walked farther
B. if Bob should walk farther
C. had Bob walked farther
D. if Bob walked farther
A. if Bob has walked farther
B. if Bob should walk farther
C. had Bob walked farther
D. if Bob walked farther
参考答案
