Robert failed three times () he finally reached the North PoleA until B before是因为如果用until的话,前面要加not 原因,才选before的吗

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Robertfailedthreetimes()hefinallyreachedtheNorthPoleAuntilBbefore是因为如果用until的话,前面要加not原因,才选before的吗R

Robert failed three times () he finally reached the North PoleA until B before是因为如果用until的话,前面要加not 原因,才选before的吗
Robert failed three times () he finally reached the North Pole
A until B before
是因为如果用until的话,前面要加not 原因,才选before的吗

Robert failed three times () he finally reached the North PoleA until B before是因为如果用until的话,前面要加not 原因,才选before的吗
是的.如果用until前面改否定