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––What a journey! We’ve finally arrived!
––_____ an out-of-date train schedule, we would not have missed the train.
A．Had we not usedB．Did we use
C．If we didn’t useD．If we had used
A

試題分析：通過分析句子，可知其中包含一個虛擬條件句。根據主句“we would not have missed the train”可看出這是對過去情況的虛擬，所以條件句用過去完成時。又因為虛擬條件句中有had, should, were時，可以將if去掉，然后把had, should, were提到主語前面，故選A。
點評：注意區(qū)分真實條件句和虛擬條件句，真是條件句實現(xiàn)的可能性非常大，而虛擬條件句往往指不能實現(xiàn)的或純屬假想的情況。
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