What would have happen___,as far as the river bank?5.What would have happened______,as far as the river bank?（2001上海）A.Bob had walked farther B.if Bob should walk farther C.had Bob walked farther D.if Bob walked farther为什么答案选C,希望得到详细解析.
问题描述：
What would have happen___,as far as the river bank?
5.What would have happened______,as far as the river bank?（2001上海）
A.Bob had walked farther B.if Bob should walk farther
C.had Bob walked farther D.if Bob walked farther
为什么答案选C,希望得到详细解析.
答
这是属于虚拟语气的,然后是句中倒装,had+主语+谓语动词+句子其他成分,提前的是句子的助动词,had做的是助动词
答
A 如果有if，则和C相同；
B should不用于虚拟语态
C 没有if的情况下，had需要提前，强调表示“如果已经发生”
D 缺少C的强调。
我语法不好，只能凭语感解释，请多包涵。
另外，不苛求的话D也能成立，勉强吧……
答
C.had Bob walked farther
倒装,= if Bob had walked farther
表示与过去事实相反,所以用had walked
答
这个是虚拟语气had sb done=if sb had done固定用法