Question

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

1. A.
   or
2. B.
   but?
3. C.
   and
4. D.
   so

Answer 1

C
试题分析：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。
考点：考查固定句型
点评：这个句型和“祈使句+and+陈述句”这个句型很相似。其中的祈使句相当于if引导的条件状语从句，如果陈述句表示否定，用连词or。