题目：
What would have happened _____, as far as the river bank? [ ]
A. Bob bad 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。
A、青藏高原海拔高，雪山连绵，冰川广布．故A是错误的． B、内蒙古高原海拔1000米左右，地面坦荡，起伏和缓．故错误的． C、云贵高原石灰岩分布广泛，地面崎岖．所以沟壑纵横，水土流失严重是错误的． ...
