Five minutes earlier, ______ we could have caught the last train.

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问题 Five minutes earlier, ______ we could have caught the last train.

选项 A、and
B、but
C、or
D、so

答案A

解析 当and连接一个祈使句和一个陈述句时,它前面的祈使句表示条件,相当于if引导的条件状语从句,如:Drop a small stone into still water,and you will see ripples go out in all directions.如果向平静的水中投一块小石子,你就会看到水波向四周散开。有时候,and前用一名词或名词词组,也可起到同样的作用,如:One more try,and you will succeed.再尝试一下,你就会成功。
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