主动语态转化被动语态.I have been to america twice.

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主动语态转化被动语态.Ihavebeentoamericatwice.主动语态转化被动语态.Ihavebeentoamericatwice.主动语态转化被动语态.Ihavebeentoamericat

主动语态转化被动语态.I have been to america twice.
主动语态转化被动语态.
I have been to america twice.

主动语态转化被动语态.I have been to america twice.
这个句子没有被动语态,因为宾语是地方的句子常没有被动语态,如i arrive in beijing.等这样的句子都没有被动语态.