As a UN report warns, animals at a speed 100 times faster now than any time in the past s——青夏教育精英家教网—

摘要： As a UN report warns, animals at a speed 100 times faster now than any time in the past since the dinosaurs were wiped out. A .are dying out B. have died out C. were dying out D. had died out

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As a UN report warns, animals ________ at a speed 100 times faster now than any time in the past since the dinosaurs were wiped out．