we didn't understand( )he said meantA what all B all that 为什么选A

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wedidn''tunderstand()hesaidmeantAwhatallBallthat为什么选Awedidn''tunderstand()hesaidmeantAwhatallBallthat为

we didn't understand( )he said meantA what all B all that 为什么选A
we didn't understand( )he said meant
A what all B all that 为什么选A

we didn't understand( )he said meantA what all B all that 为什么选A
后面的从句中缺少宾语所以要用what充当宾语