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虚拟语气We are safer in a train than we would be if we ______ an

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虚拟语气
We are safer in a train than we would be if we ______ any other way.
A.travel B.have travelled C.travelled D.had travelled
请说明理由,
虚拟语气We are safer in a train than we would be if we ______ an
这个是个虚拟语气.答案是C.如果这样说If we travelled any other way,we should be safe.这样你可以更好的理解了吧.这个句子是一个对现在事实的虚拟,那么时态要往过去推一格.条件句if引导的那半句要改成过去时,主句要用would,should,could或者might加动词原形.