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单选题 2. —How was the journey? Did you come back by plane or by train?
—For some reason. I came back by train. I _____ back by plane, though.

A

could have travelled

B

should travel

C

might travel

D

would have travelled

正确答案 :A

解析

本题考查英语语法——情态动词。
句意:由于某种原因,我是坐火车回来的。尽管我本可以坐飞机回来。这是对过去情况的叙述,所以只能在A、D两项中选。could have done表示“过去本可以做某事却没有做”;would have done表示“过去将要做某事却没有做”。故A项符合题意。
B、C、D项为干扰选项,故排除。
故本题答案为A。