问如何改成被动语态呢betty has posted five letters

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问如何改成被动语态呢bettyhaspostedfiveletters问如何改成被动语态呢bettyhaspostedfiveletters问如何改成被动语态呢bettyhaspostedfivele

问如何改成被动语态呢betty has posted five letters
问如何改成被动语态呢
betty has posted five letters

问如何改成被动语态呢betty has posted five letters
要用现在完成时态的被动句 是Five Letters Have Been Posted By Betty .