类型：单选题

问题：The goods （）when we arrived at the airport.

选项：

were just unloading

were just been unloading

had just unloaded

were just being unloaded

答案：D

解析：

本题考点是时态语态知识。goods与unload是被动关系，货物被卸下。句意“当我们到达机场的时候。这些货物恰巧正在被卸下来。”选择D