people don't know the value ___they have until it's gone.A that B what C which很抱歉，此题错了，不必回答了。
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peopledon''tknowthevalue___theyhaveuntilit''sgone.AthatBwhatCwhich很抱歉，此题错了，不必回答了。peopledon''tknowtheval
people don't know the value ___they have until it's gone.A that B what C which很抱歉，此题错了，不必回答了。
people don't know the value ___they have until it's gone.A that B what C which
很抱歉，此题错了，不必回答了。
people don't know the value ___they have until it's gone.A that B what C which很抱歉，此题错了，不必回答了。
A that
岂不在作弄人吗?