people don't know the value of___they have until it's gone.A what B that C which D whose
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peopledon''tknowthevalueof___theyhaveuntilit''sgone.AwhatBthatCwhichDwhosepeopledon''tknowthevalueof___
people don't know the value of___they have until it's gone.A what B that C which D whose
people don't know the value of___they have until it's gone.A what B that C which D whose
people don't know the value of___they have until it's gone.A what B that C which D whose
A what作of的宾语和从句中have的宾语
b.what
应该选C
A.what