They have already read an write填问号(can,could,be able to)适当形式

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Theyhavealreadyreadanwrite填问号(can,could,beableto)适当形式Theyhavealreadyreadanwrite填问号(can,could,beablet

They have already read an write填问号(can,could,be able to)适当形式
They have already read an write
填问号(can,could,be able to)适当形式

They have already read an write填问号(can,could,be able to)适当形式
been able to

they have already 用完成时 应该是 been able to read and write 吧