54.[2001上海] What would have happened ________, as far as the river bank?

A. Bob had walked farther

B. if Bob should walk farther

C. had Bob walked farther

D. if Bob walked farther

 

答案：C
提示：

題目考察if連接的條件句中的虛擬語氣結構：

表示未來實現(xiàn)的可能性極小, if從句用“should / were to + do”，主句中“should / would / could / might to do”

例如：If I should / were to so the experiment, I would do it some other way.

表示與現(xiàn)在事實相反，if從句用過去式，主句用“should / would / could / might + to do”

例如：If I had a bike, I would lend it to you.

表示與過去事實相反，if從句用過去完成式，主句用“should / would / could / might + to have done”

例如：If he had been here, he would have helped you.

并注意，if從句中，若有were, had, should三詞時，可省去if，同時采用主謂語倒裝形式來表示條件。

例如：Should anyone call, please take a message.

 


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