问题描述：
一个英语句子,关于had been done
three executives who had been briefed on the plans but spoke on the condition of anonymity because they were not authorized to discuss the matter.
这句话中 had been briefed 是过去完成时的被动语态么?为什么要用被动呢?感觉被动反而解释不通啊,如果不是,请高人告知这是个什么用法,
three executives who had been briefed on the plans but spoke on the condition of anonymity because they were not authorized to discuss the matter.
这句话中 had been briefed 是过去完成时的被动语态么?为什么要用被动呢?感觉被动反而解释不通啊,如果不是,请高人告知这是个什么用法,
问题解答：
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