SuchanimalsasSouthChinatigersarebelieved__________.,forwe'vehadnotrackofthemforages.
A.becoming extinct B.to become extinct C.to have been extinct D.having been extinct正确答案C
SuchanimalsasSouthChinatigersarebelieved__________.,forwe'vehadnotrackofthemforages.
A.becoming extinct B.to become extinct C.to have been extinct D.having been extinct正确答案C
