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问题: 英语选词e

Five minutes earlier, ____ we could have caught the last train.
A. and B. or C. so D. but

解答:

A. 这道题实际上是:祈使句, and...
此处祈使句就相当于条件状语从句。
这句话如果用从句,应该是: If we had been given five minutes, we could have caught the last train.