Three minutes earlier we could have caught the early train to Philadelphia.A. orB. butC.

问题补充：

Three minutes earlier we could have caught the early train to Philadelphia.

A. or

B. but

C. and

D. so

答案：

A. or

B. but

(答案→)C. and

D. so

解析：考查固定句型：本题中名词短语相当于祈使句的省略句，句型是：名词+and简单句，题干可换成“条件句+陈述句”结构，即If we had set out three minutes earlier,we could have caught the early train to Philadelphia.句意：再早3分钟，我们就能赶上去费城的早班车了。选C。