问题
选择题
What would have happened ________, as far as the cliff?
A．if Bob has walked farther
B．if Bob should walk farther
C．if Bob had walked farther
D．if Bob walked farther
答案
答案：C
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What would have happened ________, as far as the cliff?
A．if Bob has walked farther
B．if Bob should walk farther
C．if Bob had walked farther
D．if Bob walked farther
答案：C