【送分题】the plane was late and detectives were waiting at the airport all morning.

题目

【送分题】the plane was late and detectives were waiting at the airport all morning.
l有两个现在进行时的特例把我搞糊涂了
1、新概念2第七课的
the plane was late and detectives （were waiting ）at the airport all morning
这句为什么用过去进行时呢?“等了整整一个上午”又不是正在等一个上午,所以应该用过去完成时啊?“已经等了整整一个上午”这样说着才顺嘛2、she is always

答案

从语义上讲：原文意在强调一个持续的动作,一刻不停；用完成时则只是说明做了这件事情,并不能生动的告诉读者他们是一刻不离的守在机场；
另外,从“前后一致”的原则出发,使用过去进行时也是正确的；