Such animals as South China tigers are believed_______, for we’ve had no track of them for ages.A、becoming extinctB、to become extinctC、to have been extinctD、having been extinct-易过题库-题库最全的搜题网站

Such animals as South China tigers are believed_______, for we’ve had no track of them for ages.

Abecoming extinct

Bto become extinct

Cto have been extinct

Dhaving been extinct

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