Yesterday I was told them we would have a picnic in the park这句话为什么用被动语态?

问题描述:

Yesterday I was told them we would have a picnic in the park
这句话为什么用被动语态?

Yesterday,I was told them,that we would have a picnic in the parkbecause "Yesterday",so I was told them,not I am told them..Maybe somebody ask me "what are you done yesterday?",then I would answer "I ...