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问题: 英语

What would happened () as far as the river bank?
A Bob had walked farther
B if Bob should walked farther
C had Bob walked farther
D if Bob walked farther

解答:

What would have happened (C) as far as the river bank?
A Bob had walked farther
B if Bob should walked farther
C had Bob walked farther
D if Bob walked farther
表示与过去事实相反的假设,主句:would have done,从句:had done,倒装的省略形式,省if,had提句首