was being done 是被动语态的过去进行时态,是说某件事情在过去的一个时间点正在被做
has been done 是现在完成时的第三人称单数做主语的形式
例如：
The research was being done when the professor went into the lab last night.
The research has been finished.
was being done和has been done的区别
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