问题描述：
The goods______when we arrived at the airport.A.
The goods______when we arrived at the airport.
A.were just unloading B.were just been unload C.were just being unloaded D.had just unload
The goods______when we arrived at the airport.
A.were just unloading B.were just been unload C.were just being unloaded D.had just unload
问题解答：
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