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；
【送分题】the plane was late and detectives were waiting at the a
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